JP6870980B2 - Ultrasonic inspection equipment, ultrasonic inspection method, and manufacturing method of joint block material - Google Patents

Description

The present invention relates to an ultrasonic inspection apparatus, an ultrasonic inspection method, and a method for manufacturing a joint block material.

Defects such as voids and cracks that occur in joints such as welding and brazing cause the strength of the joints to decrease, so inspection is important. An ultrasonic flaw detection test (UT: Ultrasonic testing) is an example of a non-destructive inspection test for non-destructively inspecting the welded state of a joint or the state of a weld defect.

The ultrasonic inspection device that employs ultrasonic flaw detection technology irradiates the welded part of the inspection object with ultrasonic waves, images the reflected echo, and displays it on the display device as an ultrasonic image, and the displayed welded part. The image of the above is visually judged, and the condition of the welded part and the condition of the weld defect are inspected non-destructively.

Japanese Unexamined Patent Publication No. 2012-122807 Japanese Patent No. 4544240

However, when the inspection target (inspection object) contains, for example, a portion that inhibits the propagation of ultrasonic waves made of cavities or dissimilar materials (hereinafter referred to as "ultrasonic obstruction portion"). In the conventional ultrasonic inspection apparatus and ultrasonic inspection method, the reflected wave from the joint cannot be received in a part of the joint, and a range that cannot be inspected may occur.

The present invention has been made in view of the above-mentioned circumstances, and is an ultrasonic inspection apparatus that broadens the inspectable range even for an inspection target such as a joint block material having an ultrasonic obstruction portion inside. And an ultrasonic inspection method and a method for manufacturing a joint block material.

In order to solve the above-mentioned problems, the ultrasonic inspection apparatus according to the embodiment of the present invention is provided with an ultrasonic blocking portion having different acoustic impedances inside, and has no side in contact with the joint surface and the joint surface. The inside of a joint block material having three or more non-opposite surfaces having a facing surface facing the joint surface and a side in contact with the joint surface and another member joined to the joint surface of the block material. an ultrasonic flaw detection apparatus for ultrasonic flaw detection, pre SL one ultrasonic transmit-receive unit even without least an ultrasonic configured to be transmitted from the first surface in advance one face that defines of the non-facing surface And, because there is a direct flaw-detectable range that is set on the joint surface and can be directly flaw-detected from the first surface using the ultrasonic transmission / reception means and the ultrasonic obstruction portion, the first surface is said to be super-ultrasonic. A flaw detection range setting means capable of setting information on a direct flaw detection impossible range that cannot be directly detected by using the ultrasonic transmission / reception means, and a propagation path such that the ultrasonic waves transmitted from the ultrasonic transmission / reception means are directed to the direct flaw detection impossible range. It is characterized in that it includes a means for changing a propagation route to be set.

In order to solve the above-mentioned problems, the ultrasonic inspection method according to the embodiment of the present invention is provided with ultrasonically hindering portions having different acoustic impedances inside, and has no side in contact with the joint surface and the joint surface. Ultrasonic flaw detection of a block material having three or more non-opposing surfaces having a facing surface facing the surface and a side in contact with the joint surface and a joint block material having another member joined to the joint surface of the block material. In the ultrasonic inspection method, one of the non-opposing surfaces of the block material is selected as the first surface, and ultrasonic waves can be transmitted to the joint surface from the first surface. Direct flaw detection is not possible using the ultrasonic transmitting and receiving means from the first surface due to the existence of the direct flaw detecting range and the ultrasonic obstructing portion that can be directly detected by using the configured ultrasonic transmitting and receiving means. a flaw detection range setting step of setting a disabled range, at least one ultrasonic transceiver means prior Symbol first surface arranged, directly on the direct testing range of the joint surface from the ultrasonic transmitting and receiving means The primary inspection step of transmitting ultrasonic waves to the joint surface to inspect the direct flaw-detectable range, and the primary inspection step so that the ultrasonic waves face the direct flaw-detectable range of the joint surface. It is characterized by comprising a secondary inspection step of setting different propagation paths and transmitting the ultrasonic waves by the ultrasonic transmission / reception means to inspect the joint surface in the range where the direct flaw detection is impossible.

In order to solve the above-mentioned problems, the method for producing a joint block material according to an embodiment of the present invention has a joint surface facing the joint surface and the joint surface facing the joint surface without having a side in contact with the joint surface. An ultrasonic obstruction portion forming step of forming an ultrasonic obstruction portion having different acoustic impedances inside a block material having three or more non-opposing surfaces having tangent sides, and joining another member to the joint surface of the block material. A joining step, a selection step of selecting one of the non-opposing surfaces of the block material as the first surface, and an ultrasonic wave configured to be able to transmit ultrasonic waves to the joining surface from the first surface. A direct flaw-detectable range in which direct flaw detection is possible using the transmission / reception means and a direct flaw-detection impossible range in which direct flaw detection is not possible using the ultrasonic transmission / reception means from the first surface due to the presence of the ultrasonic obstruction portion are set. a flaw detection range setting step, after the bonding step, directly from at least one place ultrasonic transmitting and receiving means and the ultrasonic wave transmission and reception means prior Symbol first surface with respect to the direct testing range of the joining surface A primary inspection step of inspecting the direct flaw-detectable range of the joint surface by transmitting ultrasonic waves to the joint surface, and the above 1 so that the ultrasonic waves face the direct flaw-detectable range of the joint surface after the joint step. It is characterized by including a secondary inspection step in which a propagation path different from the next inspection step is set and the ultrasonic waves are transmitted by the ultrasonic transmission / reception means to inspect the joint surface in the range where the direct flaw cannot be detected. And.

According to the embodiment of the present invention, the range that can be inspected can be broadened even for an inspection object having an ultrasonic wave blocking portion inside.

The schematic diagram which showed the structure of the ultrasonic inspection apparatus which concerns on this embodiment together with the internal cross section of the inspection object (inspection object). The explanatory view explaining the 1st modification of the ultrasonic inspection apparatus which concerns on this embodiment. The explanatory view explaining the 2nd modification of the ultrasonic inspection apparatus which concerns on this embodiment. The explanatory view which shows the outline of the ultrasonic inspection method (the first inspection method) which concerns on this embodiment. The explanatory view which shows the outline of the ultrasonic inspection method (second inspection method) which concerns on this embodiment. VI-VI line sectional view of the inspection object (inspection object) to be inspected by the second inspection method. VII-VII line sectional view of an inspection object (inspection object) to be inspected by the second inspection method. Explanatory drawing which shows the outline of the ultrasonic inspection method (third inspection method: a single monocular probe is applied) which concerns on this embodiment. Explanatory drawing which shows the outline of the ultrasonic inspection method (third inspection method: 1 set (two) of monocular probes are applied) which concerns on this Embodiment. The explanatory view which shows the outline of the ultrasonic inspection method (third inspection method: a single linear array probe is applied) which concerns on this embodiment. Explanatory drawing which shows the outline of the ultrasonic inspection method (third inspection method: 1 set (two) of linear array probes are applied) which concerns on this Embodiment. It is explanatory drawing which shows a preferable example of the ultrasonic inspection method which concerns on this Embodiment which includes the step of focusing ultrasonic waves, and is the partial enlarged view near the joint part of the joint block.

Hereinafter, the ultrasonic inspection apparatus, the ultrasonic inspection method, and the manufacturing method of the joint block material according to the embodiment of the present invention will be described with reference to the accompanying drawings.

The directions such as upper, lower, left, right, front, rear, horizontal, and vertical used in the following description are directions based on the illustrated state or the normal use (inspection) state. Also, in the text, it is not necessary to distinguish between the specular reflected wave (normal reflected wave) generated by specular reflection (normal reflection) of the incident wave and the diffuse reflected wave (scattered wave) generated by diffuse reflection (scattering). Then, both are referred to as "reflected waves" and will be comprehensively explained.

FIG. 1 is a schematic view showing the configuration of an ultrasonic inspection device 10 which is an example of an ultrasonic inspection device according to the present embodiment, together with an internal cross section of a joint block material 1 which is an inspection object (inspection object). ..

In the three-dimensional Cartesian coordinate system consisting of three orthogonal axes (x-axis, y-axis and z-axis) shown in FIG. 1, the x-axis direction is the width (horizontal or horizontal) direction and the y-axis direction is the depth (vertical or front-back). ) Direction and z-axis direction are height (up and down) directions.

The joining block material 1 is formed by joining, for example, a block material 2 made of a polyhedron such as a rectangular parallelepiped and another member 3 different from the block material 2 by welding such as metal or resin or welding such as TIG or MIG. It is configured and has a joint portion 4 including a joint surface P between the block material 2 and the other member 3 between the block material 2 and the other member 3. That is, as shown in FIG. 1, when the block material 2 of the joint block material 1 is viewed in the y-axis (depth) direction, the joint surface P, the facing surface facing the joint surface P, and not facing the joint surface P It has a quadrangular shape consisting of a pair of non-opposing surfaces. Here, the facing surface facing the joint surface P is a surface having no side in contact with the joint surface P, and the non-opposing surface not facing the joint surface P is a surface having a side in contact with the joint surface P. is there.

In the following, since the case where the block material 2 is a rectangular body will be described as an example, the surface facing the joint surface P when the block material 2 is viewed in the y-axis (depth) direction is the joint surface P. A pair of non-opposing surfaces when viewed in the y-axis (depth) direction (that is, a pair of surfaces forming end faces in the x-axis (width) direction) and when viewed in the x-axis (width) direction. The pair of non-opposing surfaces (that is, the pair of surfaces forming the end faces in the y-axis (depth) direction) in the case are perpendicular to the joint surface P, respectively.

The block material 2 of the present embodiment is not limited to a rectangular parallelepiped, and can be applied to any polyhedron having a joint surface P, its facing surface, and three or more non-opposing surfaces. The facing surfaces of the joint surfaces P may be composed of two or more surfaces as long as they do not have a side in contact with the joint surface P. Further, in the polyhedral-like block material 2, the joint surface P to be joined to the other member 3 is more preferably a flat surface in terms of joining, but any of the surfaces including the joint surface P is used. Or all may be curved.

Further, inside the block material 2, an ultrasonic wave blocking portion 5 that inhibits the propagation of ultrasonic waves is provided. The ultrasonic wave blocking portion 5 is a portion having an acoustic impedance different from the acoustic impedance of the block material 2, and is formed of, for example, a material or a cavity different from the material of the block material 2.

In the first embodiment of FIG. 1, the ultrasonic wave blocking portion 5 is formed over the entire y-axis (depth) direction, but the ultrasonic wave is partially formed in the y-axis (depth) direction. This embodiment is applicable even if the inhibitory portion 5 is formed. The existence range of the ultrasonic obstruction unit 5 in the y-axis (depth) direction may differ depending on the positions in the x-axis (width) direction and the y-axis (height) direction.

In the method for producing the bonded block material 1 of the present embodiment, for example, first, an ultrasonic wave inhibiting portion 5 is formed inside the blocking material 2 (ultrasonic wave inhibiting portion forming step). The ultrasonic wave blocking portion 5 is provided inside the block material 2, for example, by processing a hollow portion in the block material 2 or joining a material different from the block material 2 to the block material 2.

At the joint surface P of the block material 2 on which the ultrasonic obstruction portion 5 is formed, the block material 2 and the other member 3 are joined by welding with, for example, metal or resin, welding with TIG, MIG, or the like (joining step).

In the present embodiment, the order of forming the ultrasonic wave blocking portion 5 inside the block material 2 (ultrasonic blocking portion forming step) and joining the block material 2 and the other member 3 (joining step) is reversed. An ultrasonic wave blocking portion may be formed inside the block material 2 after the block material 2 and another member are first joined.

In the joint block material 2 of the present embodiment, the joint portion P between the block material 2 and the other member 3 in which the ultrasonic wave obstructing portion 5 is formed therein is inspected by the ultrasonic inspection method of the present embodiment described later. Manufactured by

The acoustic contact medium 7 is in close contact with the surface of the joint block material 1 and the contact surfaces of the ultrasonic probes 11 and 12 of the ultrasonic inspection device 10 so that ultrasonic waves are efficiently propagated to the joint block material 1. Will be done. The acoustic contact medium 7 is a medium capable of propagating ultrasonic waves such as machine oil, castor oil and fats and oils such as glycerin, and water, acrylic, polystyrene and gel.

When ultrasonic waves are transmitted to the joint block material 1 provided with the ultrasonic wave blocking portion 5 inside the block material 2, the surface of the ultrasonic wave blocking part 5 is different from the acoustic impedance of the block material 2. Since the incident ultrasonic waves are reflected, when the ultrasonic wave blocking section 5 is present in the traveling (propagating) direction of the incident ultrasonic waves, the ultrasonic blocking section 5 hinders the further progress (propagation) of the ultrasonic waves. It ends up.

When inspecting the joint state of the joint block material 1 provided with the ultrasonic obstruction portion 5 inside the block material 2, ultrasonic waves are applied to the joint surface P at least a part of the joint surface P in the joint portion 4. There is a portion that cannot be reached, that is, a portion where a reflected wave (reflected echo) cannot be obtained at the joint surface P.

Therefore, the ultrasonic inspection device 10 is one that can be arbitrarily selected from non-opposing surfaces (surfaces that are not parallel to the joint surface P in the example of FIG. 1) that have a tangent to the joint surface P and do not face the joint surface P. Ultrasonic waves are incident from the surface (first surface) to reach the joint surface P to obtain reflected waves (reflected echo) from the joint surface P, while the ultrasonic waves incident by the ultrasonic obstruction unit 5 are applied to the joint surface P. In the range where the ultrasonic wave cannot be reached, the propagation path of the ultrasonic wave is changed so that the ultrasonic wave is incident and reaches the joint surface P, and the reflected wave (reflected echo) from the joint surface P can be obtained. To.

That is, the ultrasonic inspection device 10 of the present embodiment includes at least one ultrasonic wave transmitting / receiving means configured to be able to transmit ultrasonic waves from at least one non-opposing surface, which is a predetermined surface. A flaw detection range setting means for setting a direct flaw detection possible range in which direct flaw detection is possible from the first surface using an ultrasonic transmitting / receiving means and a direct flaw detection impossible range outside the direct flaw detection possible range on the joint surface P, and the ultrasonic wave It is provided with a propagation path changing means for setting a propagation path so that the ultrasonic waves transmitted from the transmission / reception means are directed to the direct flaw detection impossible range. In the following, a case where the first surface is any one of a pair of surfaces forming an end surface in the x-axis (width) direction will be described as an example.

As a method of changing the propagation path of ultrasonic waves, for example, a method of injecting ultrasonic waves from a second surface having a positional relationship not facing the first surface to reach the joint surface P, that is, changing the incident position. There is a way to do it. In the case of this method, either the facing surface of the joint surface P is set as the second surface as shown in FIG. 4, or, for example, either of the pair of surfaces forming the end surface in the x-axis (width) direction is used as the first surface. Any one of the pair of surfaces forming the end surface in the y-axis (depth) direction when the surface is used can be the second surface. In this case, the ultrasonic wave transmitting / receiving means installed on the second surface serves as the propagation path changing means.

Further, as another method of changing the propagation path of the ultrasonic wave, for example, as shown in FIGS. 8 to 11, the ultrasonic wave is once reflected by the ultrasonic wave blocking unit 5 and then reaches a desired inspection point. There is also a method. In this case, the incident condition setting such as the incident position and the incident angle of the ultrasonic wave that reaches the desired inspection point after the ultrasonic wave is once reflected from the incident point on the first surface to the ultrasonic obstruction portion 5 is set. The means (for example, the delay time calculation unit 142 described later) serves as the propagation path changing means.

The ultrasonic inspection device 10 includes, for example, at least one ultrasonic probe (hereinafter, referred to as “main probe”) 11 as an ultrasonic transmission / reception means, and ultrasonic waves added according to the inspection method. An ultrasonic probe (hereinafter referred to as an "auxiliary probe") 12 as a transmission / reception means, a signal generation means 13, a drive element control means 14, a signal detection means 15, and an imaging information generation means 16. This device is suitable for ultrasonic flaw detection inspection of the joint block material 1 which is an inspection target (object to be inspected).

The ultrasonic wave transmitting means includes at least an ultrasonic probe 11, thereby at least on a predetermined first surface (in the example shown in FIG. 1, one surface of the end surface in the x-axis (width) direction). It is configured to be installed so that ultrasonic waves can be transmitted from the first surface.

The ultrasonic probes 11 and 12 as ultrasonic transmission / reception means have a function of mutually converting ultrasonic vibration and an electric signal to transmit / receive ultrasonic waves of a required frequency, and at least one piezoelectric element 21 is used. It is provided with a conversion unit to be arranged and a damping unit for reducing the reflection of ultrasonic waves during transmission and reception. For example, in the ultrasonic probe 11, n (n is a natural number) piezoelectric elements 21_1 to 21_n are arranged, and in the ultrasonic probe 12, m (m is a natural number) piezoelectric elements 21_1 to 21_m are arranged. There is. It should be noted that n and m may be different natural numbers or the same natural numbers. That is, not only the case where n ≠ m but also the case where n = m holds is included.

The ultrasonic probes 11 and 12 convert an electric signal into ultrasonic waves of piezoelectric elements 21_1 to 21_n and inject ultrasonic waves into the bonding block material 1, while reflected waves (reflected echo) of ultrasonic waves from the bonding block material 1. ) Is received, and an electric signal obtained by converting the received reflected wave, that is, an electric signal based on the reflected wave is output to the signal detecting means 15.

The angle (incident angle) of the ultrasonic waves that can be incident on the ultrasonic probes 11 and 12 varies depending on the ultrasonic probes 11 and 12 used, but usually, a perpendicular line to the contact surface with the joint block material 1 is provided. The ultrasonic probes 11 and 12 can be applied while maintaining the required detection accuracy as long as the reference (0 degree) is within the range of about 70 degrees.

The range of the angle (incident angle) of the ultrasonic waves that can be incident, the position where the ultrasonic probe 11 can be installed on the first surface, the shape and dimensions of the block material 2 including the joint surface P of the joint block material 1, and the super Given the shape and dimensions of the sound wave blocking portion 5, it is possible to detect flaws by directly transmitting and receiving ultrasonic waves from the first surface of the joint surface P using the ultrasonic probe 11. Even if the ultrasonic probe 11 is used from the first surface, ultrasonic waves can be directly detected from the first surface because the ultrasonic wave blocking portion 5 is present inside the block material 2 because it is outside the range and the direct flaw detection range. It is possible to determine the range in which direct flaw detection is not possible by transmitting and receiving.

Here, the fact that ultrasonic waves can be directly transmitted and received means that the ultrasonic waves reach the inspection point without being reflected or the like, and the reflected ultrasonic waves (reflected echo) reflected from the inspection point are received without being reflected or the like. Refers to what can be done. In this case, it does not prevent the ultrasonic wave transmission point and the ultrasonic wave reception point from being present on different surfaces.

In this way, the ultrasonic inspection apparatus 10 of the present embodiment inputs in advance the direct flaw detection possible range and the direct flaw detection impossible range obtained based on the information related to the shape of the block material 2 including at least the ultrasonic inhibition portion 5. It is provided with the flaw detection range setting means that can be set, and is controlled based on the information of the direct flaw detection possible range and the direct flaw detection impossible range set in the flaw detection range setting means.

As the flaw detection range setting means, for example, the drive element control means 14 can be configured to accept inputs of these direct flaw detection possible ranges and direct flaw detection impossible ranges. Further, as another example, a computer provided separately and connected to a drive element control means 14 or the like and equipped with a CPU, a memory, and a storage device is used, and the drive element control means 14 or a signal generation is performed using this computer as a flaw detection range setting means. It may be configured to control the means 13, the signal detecting means 15, or the imaging information generating means 16.

Further, such a computer accepts input of information such as the outer shape and dimensions of the joint block material 1, the outer shape and dimensions of the ultrasonic wave blocking portion 5, and is used on the first surface of the predetermined ultrasonic probe 11. It can also be configured to automatically calculate and output, for example, the direct flaw detection range and the direct flaw detection non-detection range geometrically together with the information on the installable position and the angle range of the ultrasonic waves that can be incident.

The ultrasonic probes 11 and 12 are, for example, a monocular probe having one piezoelectric element 21_1 (when n = 1), and a plurality of piezoelectric elements 21_1 to 21_n (when n ≦ 2) are one-dimensional (when n ≦ 2). A linear array probe arranged in a linear shape), a matrix array probe in which a plurality of piezoelectric elements 21_1 to 21_n (in the case of n≤2) are two-dimensionally arranged, and a plurality of ring-shaped piezoelectric elements 21_1 Various types such as a ring array probe in which ~ 21_n (in the case of n ≦ 2) are arranged concentrically, a non-uniform array probe in which a plurality of piezoelectric elements 21_1 to 21_n (in the case of n ≦ 2) are unevenly arranged, and the like. It can be selected arbitrarily from the probe.

The main probe 11 is movably arranged on a surface of a first surface that is non-parallel to the joint surface P of the joint portion 4 that is inherent in the joint block material 1 that is the object to be inspected (object to be inspected). , At least one of transmitting and receiving ultrasonic waves from the first surface. For example, in the ultrasonic inspection apparatus 10 illustrated in FIG. 1, on the surface of the left side surface which is one of the surfaces non-parallel to the joint surface P (four side surfaces in the block material 2 exemplified in FIG. 1). The main probe 11 is arranged so as to be movable in the height direction (z-axis direction).

In the case of the pitch catch method in which the transmitting side and the receiving side are separately prepared and inspected for the ultrasonic probe 11, the transmitting side main probe 11t (FIG. 2, etc.) and the ultrasonic wave as the ultrasonic transmitting means. As a receiving means, a set (two) of the receiving side main probe 11r (FIG. 2 and the like) of the ultrasonic probe 11 is used. The surface on which the receiving side main probe 11r is arranged may be the same as or different from the surface on which the transmitting side main probe 11t is arranged.

The auxiliary probe 12 is a propagation path changing means used for detecting a range in which the joint surface P cannot be directly detected by the main probe 11, as in the first inspection method described later. As an example, the main probe 11 is movably arranged on a surface that is not parallel to the surface of the joint block member 1 to which the main probe 11 moves. That is, the auxiliary probe 12 is configured so that it is possible to set a propagation path such that the ultrasonic waves transmitted by the auxiliary probe 12 are directed to the directly non-detectable range of the joint surface P.

For example, in the ultrasonic inspection apparatus 10 illustrated in FIG. 1, the upper surface (top surface) located parallel to and above the joint surface P inherent in the joint block material 1, that is, the main probe 11 can be moved. The auxiliary probe 12 is movably arranged in the left-right direction (x-axis direction) on the surface of the surface perpendicular to the side surface of the joint block member 1 to be arranged.

In the following description, a case where a monocular probe or a linear array probe is applied will be described as an example of the ultrasonic probes 11 and 12.

The signal generating means 13 has a function of generating a driving signal to be given to the piezoelectric elements 21_1 to 21_n arranged in the ultrasonic probes 11 and 12 according to the control signal received from the driving element controlling means 14.

The drive element control means 14 includes, for example, a control signal generation unit 141 having a function of generating a control signal for selectively driving the piezoelectric elements 21_1 to 21_n arranged in the ultrasonic probes 11 and 12, and a main probe. Among the piezoelectric elements 21_1 to 21_n in the tentacle 11, the generated control signal is provided with a delay time calculation unit 142 having a function of calculating the delay time for adjusting the timing of exciting the voltage to the piezoelectric elements 21_1 to 21_n to be driven. Is given to the signal generating means 13, and the piezoelectric elements 21_1 to 21_n to be driven are individually controlled. In the present embodiment, the delay time calculation unit 142 sets a propagation path so that the ultrasonic waves transmitted from the main probe 11 which is the ultrasonic transmission / reception means are directed to the direct flaw detection impossible range of the joint portion P. It corresponds to an example of the above-mentioned incident condition setting means.

Further, the drive element control means 14 transmits ultrasonic waves from the main probe 11 at a predetermined incident angle by giving a control signal based on the calculation result of the delay time to the signal generation means 13, or the main probe. The ultrasonic waves incident from No. 11 can be focused on one point (focus F: FIG. 8 and the like).

The signal detecting means 15 receives and detects the electric signal of the reflected echo from the joint portion 4 in the joint block 1 (inspection object) from the ultrasonic probes 11 and 12. The electric signal of the reflected echo detected by the signal detecting means 15 is sent to the imaging information generating means 16.

The imaging information generating means 16 calculates and processes the electric signal of the reflected echo detected by the signal detecting means 15 to generate imaging information (data) representing an ultrasonic image such as a three-dimensional (3D) ultrasonic image. ..

The ultrasonic inspection device 10 described above is an example, and may further include other means such as a display means for displaying an image based on imaging information (data) in a predetermined format. Further, the ultrasonic probes 11 and 12 to which caulking and packing are appropriately added may be applied to configure the ultrasonic inspection device 10 so that it can be used in air or in water.

Further, when the outer shape and dimensions of the joint block material 1 are known, an ultrasonic inspection device 10 including ultrasonic probes 11 and 12 having a shape and dimensions that can be arranged according to the outer surface of the joint block material 1 is configured. You can also do it.

2 and 3 are explanatory views for explaining the first modification and the second modification of the ultrasonic inspection apparatus 10, respectively, and are designed in consideration of the shape and dimensions of the joint block material 1. It is the schematic which shows the ultrasonic probe 11 and 12.

In the drawings after FIG. 2, the components other than the ultrasonic probes 11 and 12 such as the signal generating means 13 in the ultrasonic inspection device 10 are not shown. Further, components that overlap with the components shown in FIG. 1, such as the joint block material 1 (object to be inspected), the main probe 11, and the auxiliary probe 12, are described with the same reference numerals. Is omitted.

When the outer shape and dimensions of the joint block material 1 are known, for example, as shown in FIG. 2, the ultrasonic probe 11 or the ultrasonic probes 11 and 12 are aligned with the outer surface of the joint block material 1. It can be composed of a linear array probe or a matrix array probe having a shape and dimensions that can be mounted.

In particular, in this case, the drive element control means 14 and the signal generation means 13 of the ultrasonic inspection device 10 are the main probe 11 and the auxiliary probe based on the information of the set direct flaw detection range and the direct flaw detection impossible range. It is preferable that the control of 12 is switched. That is, it is preferable that the piezoelectric elements 21 (21_1 to 21_n, 21_1 to 21_m) incorporated in the main probe 11 and the auxiliary probe 12 are independently controllable.

The ultrasonic probe 11 illustrated in FIG. 2 is an example in which one linear array probe is used as the transmitting side main probe 11t and the receiving side main probe 11r, but one set (two). The transmitting side main probe 11t and the receiving side main probe 11r may be configured by the linear array probe of the above.

Further, as illustrated in FIG. 3, the ultrasonic probe 11 or the ultrasonic probes 11 and 12 may be configured in a gate type (gate type) through which the joining block material 1 can pass while being in contact with each other. .. That is, the ultrasonic probe 11 or the ultrasonic probes 11 and 12 may be a probe gate 17 including the ultrasonic probe 11 or the ultrasonic probes 11 and 12.

Further, as illustrated in FIG. 3, it is a means for transporting the joint block material 1 (in the y-axis direction in the example of FIG. 3), and is a gate type (gate type) on the transport path of the joint block material 1. A transport means 18 such as an ultrasonic probe 11 or a belt conveyor on which the ultrasonic probes 11 and 12 are arranged may be added to the ultrasonic inspection device 10 to form an inspection line for the ultrasonic inspection device 10. At this time, it is also possible to provide the entire ultrasonic inspection device 10 by immersing it in an acoustic contact medium such as water or oil, and to inspect the bonding block material 1 in a state of being immersed in these ultrasonic contact media. Is.

Next, the ultrasonic inspection method according to the embodiment of the present invention will be described by taking the case where the inspection object (inspection object) is the above-mentioned joint block material 1 as an example.

The ultrasonic inspection method according to the embodiment of the present invention is an inspection method on the premise that ultrasonic waves are transmitted and received from the block material 2 side on which the ultrasonic wave blocking portion 5 is provided, and ultrasonic waves are emitted from the other member 3 side. This is an inspection method that does not send or receive.

In the ultrasonic inspection method according to the embodiment of the present invention, in the conventional method, the ultrasonic waves reach the ultrasonic obstruction portion 5 before reaching the target inspection point, and the ultrasonic waves reach the target inspection point. A surface (first surface) that is non-parallel to the joint surface P, such as the left side surface of the joint block material 1 (object to be inspected), with respect to the joint block material 1 (object to be inspected) that has an inspection point that cannot be inspected. ), And the primary inspection step and the primary inspection to obtain the reflected echo from the inspection point in the range where the ultrasonic waves from the first surface can directly detect the flaw (that is, the above-mentioned range where the direct flaw can be detected). Propagation path (ultrasonic is direct) different from the primary inspection process for inspection points that cannot be detected due to reasons such as ultrasonic waves cannot be reached in the process (that is, inspection points in the above-mentioned direct flaw detection impossible range). It includes a secondary inspection step in which ultrasonic waves are propagated by a propagation path (different from the primary inspection step) toward the joint surface in the non-detectable range to obtain a reflected echo from the inspection point.

That is, in the ultrasonic inspection method according to the present embodiment, a selection step of selecting one of the non-opposing surfaces of the block material 2 in the joint block material 1 (object to be inspected) as the first surface, and the joint surface P. Is divided into a direct flaw detection range that can be directly detected by the ultrasonic probe 11 from the first surface and a direct flaw detection impossible range that cannot be directly detected by the ultrasonic probe 11 from the first surface. It is composed of a range setting step, a primary inspection step of detecting a range of the joint surface P that can be directly detected, and a secondary inspection step of detecting a range of the joint surface P that cannot be directly detected. The primary inspection step and the secondary inspection step are performed after the block material 2 and the other member 3 are joined at the joint surface P, but the selection process and the flaw detection range setting process, which are other processes, are performed after the block material 2 and the other member 3 are joined. It may be done before joining.

In the selection step, any one of the non-opposing surfaces of the block material 2 is selected as the first surface. In the example shown in FIG. 1, the left side surface of the end surfaces of the block material 2 in the x-axis (width) direction is selected as the first surface.

In the flaw detection range setting step, when the ultrasonic probe 11 is installed on the first surface selected in the selection process, the ultrasonic probe 11 of the joint surface P can directly detect the flaw. The range and the range in which the ultrasonic probe 11 installed on the first surface cannot be directly detected due to the presence of the ultrasonic blocking portion 5 inside the block material 2 are obtained.

The direct flaw detection range and the direct flaw detection impossible range are the range of the incident angle of the ultrasonic wave incident from the ultrasonic probe 11, the range of the installable position on the first surface of the ultrasonic probe 11, and the joint block material 1. It can be obtained by giving the shape and dimensions of the block material 2 including the joint surface P of the above and the shape and dimensions of the ultrasonic wave blocking portion 5. Then, in the flaw detection range setting step, the direct flaw detection possible range and the direct flaw detection impossible range obtained based on the information on the shape of the block material 2 including at least the ultrasonic wave blocking portion 5 are set.

In each inspection method described later, the selection process, the flaw detection range setting process, and the primary inspection process are common, but the inspection method for inspection points (direct flaw detection impossible range) where ultrasonic waves cannot reach in the primary inspection process, That is, the secondary inspection process is different. Hereinafter, each inspection method will be described.

[First inspection method]
FIG. 4 is an explanatory diagram showing an outline of the first inspection method, which is an example of the ultrasonic inspection method according to the embodiment of the present invention.

In the first inspection method, first, any one of the surfaces non-parallel to the joint surface P (that is, the non-opposing surface) such as the left side surface of the joint block material 1 (object to be inspected) is selected as the first surface. .. Then, when the main probe 11 is installed on the selected first surface to detect the joint surface P, the range of the joint surface P that can be directly detected by the main probe 11 can be detected. Then, the direct flaw detection impossible range of the joint surface P that cannot be directly flaw detected by the main probe 11 is set. Then, the main probe 11 is arranged on the first surface, and the primary inspection step is performed using the main probe 11.

In the primary inspection step, first, the main probe 11 irradiates an ultrasonic wave (incident wave T) toward an inspection point on the joint surface P to generate a reflected echo from the joint surface P. The reflected echo includes a specular reflected wave R generated by specular reflection (normal reflection) of the incident wave T on the junction surface P and a diffuse reflected wave (hereinafter, “scattered wave”) generated by diffuse reflection (scattering) of the incident wave T. There is S.

Subsequently, the main probe 11 attempts to receive the reflected echo generated when the incident wave T incident on the junction surface P reaches the junction surface P. The main probe 11 that attempts to receive the reflected wave may be the same as the main probe 11 (transmitting side main probe 11t) that generates the incident wave T and is incident, or the transmitting side main probe. The receiving side main probe 11r different from 11t may be used.

Subsequently, when the main probe 11 receives the reflected echo generated at the junction surface P, the signal detecting means 15 (omitted in FIG. 4) determines whether or not the received reflected echo is a scattered wave S. Based on the determination result, it is determined whether or not there is a defect D such as a blow hole, a fusion defect, or a crack.

The signal waveform received by the signal detecting means 15 differs depending on whether the joint portion 4 is joined in a sound state or in an unhealthy state in which a defect D is present.

Specifically, at a sound junction where the defect D does not exist, the incident wave T is reflected without generating the scattered wave S, and propagates as a mirror surface reflected wave R in the traveling direction (face-to-face direction) of the incident wave T. On the other hand, in the defect D, the incident wave T causes the scattered wave S. Therefore, the presence or absence of the defect D can be determined depending on whether or not the scattered wave S is received.

For example, when the inspection point is a defect D, the transmitting side main probe 11t and the receiving side main probe 11t and the receiving side even if the transmitting side main probe 11t and the receiving side main probe 11r are the same main probe 11. Even if the main probe 11r is a separate main probe 11, the scattered wave S from the defect D is received. Therefore, if the receiving side main probe 11r receives the scattered wave S, the inspection is performed. It can be determined that the defect D exists at the point.

On the other hand, when there is no defect D at the inspection point (the inspection point is a sound joint), when the transmitting side main probe 11t and the receiving side main probe 11r are the same main probe 11, the inspection point is the same main probe 11. Since the specular reflected wave R cannot be received, it can be determined that there is no defect D at the inspection point (the inspection point is a sound junction) unless no reflected echo is received after transmitting the ultrasonic wave. ..

Further, when the transmitting side main probe 11t and the receiving side main probe 11r are separate main probes 11, the intensity of the reflected echo received by the receiving side main probe 11r is the case where the scattered wave S is received. If the intensity of the received reflected echo is relatively strong, it can be determined that there is no defect D at the inspection point (the inspection point is a sound junction), and if it is relatively weak, it can be determined that the inspection point is a healthy junction. It can be determined that the defect D is present in.

Regarding inspection points that can determine the presence or absence of defects D among the inspection points on the joint surface P by repeating the incident of ultrasonic waves and the reception of reflected echo while adjusting the incident position and angle of ultrasonic waves. When the determination is completed, the primary inspection process is completed. After the primary inspection step is completed, the inspection points in the directly flaw-detectable range of the joint surface P for which the presence or absence of the defect D cannot be determined in the primary inspection step (hereinafter referred to as "undetermined inspection points"). .) Perform a secondary inspection step.

In the secondary inspection step in the first inspection method, unlike the first surface on which the main probe 11 is arranged, a surface capable of transmitting ultrasonic waves to an undetermined inspection point in the direct flaw detection impossible range of the joint surface P is set. Set as the second surface. As such a second surface, for example, a top surface which has a positional relationship non-parallel to the first surface and is parallel to the joint surface P can be set. An auxiliary probe 12 is arranged on the top surface, which is the second surface set in this way, and ultrasonic waves are transmitted from the arranged auxiliary probe 12 toward the undetermined inspection point to reflect echo from the undetermined inspection point. To get.

As illustrated in FIG. 4, when the ultrasonic wave blocking portion 5 is included in the central portion of the joint block material 1 (block material 2), the range near the side surface remains as an undetermined inspection point, so that the undetermined inspection is performed. The auxiliary probe 12 is moved to a range close to the side surface of the joint block material 1 (object to be inspected) that can aim at a point, and ultrasonic waves are transmitted from above toward the undetermined inspection point to reflect echo from the undetermined inspection point. (Vertical flaw detection).

As for the received reflected echo, the signal detecting means 15 determines whether or not the received reflected echo is a scattered wave S, and whether or not a defect D exists based on the determination result, as in the primary inspection step. Is determined.

The transmission of ultrasonic waves and the reception of reflected echoes are repeated while adjusting the incident position and angle of the ultrasonic waves incident from the auxiliary probe 12, and when the determination of the undetermined inspection points is completed, the secondary inspection process is performed. When the process is completed and the secondary inspection process is completed, the entire process of the first inspection method is completed. In the present embodiment, the secondary inspection step is carried out after the primary inspection step, but the secondary inspection step is carried out first based on the information of the set direct flaw detection range and the direct flaw detection impossible range. After that, the primary inspection step may be performed, or the first inspection step and the second inspection step may be performed in parallel.

The auxiliary probe 12 shown in FIG. 4 is an example composed of a single ultrasonic probe 12 that simultaneously transmits and receives ultrasonic waves, but the auxiliary probe 12 is not always the same. It is not necessary to configure a single ultrasonic probe 12, but a set (2) of ultrasonic probes 12 (12t, 12r) that separately separates the transmission and reception of ultrasonic waves. It may be configured. In this case, one set (two) of ultrasonic probes 12 (12t, 12r) are all arranged on the top surface of the joining block 1.

Further, when installing the ultrasonic probes 11 and 12, a wedge (not shown) capable of propagating ultrasonic waves and having a known acoustic impedance is used in order to enter the joint block material 1 at an angle with high directivity. You may.

The wedge material is preferably a material (isotropic material) having no anisotropy with respect to acoustic impedance, such as acrylic, polyimide, polymer gel, and other polymer materials. is not it. In addition, a material having the same acoustic impedance as the front plate or block material 2 of the ultrasonic probes 11 and 12 or a composite material having the acoustic impedance changed stepwise or gradually can be used.

[Second inspection method]
FIG. 5 is an explanatory diagram showing an outline of a second inspection method, which is an example of the ultrasonic inspection method according to the embodiment of the present invention.

6 and 7 are a cross-sectional view (VI-VI line sectional view) and a VII-VII line (FIG. 5) of the joint block material 1 when cut along the VI-VI line (FIG. 5), respectively. It is a cross-sectional view of (VII-VII line cross-sectional view).

The second inspection method is different from the first inspection method in that the auxiliary probe 12 (FIGS. 6 and 7) used in the secondary inspection step is arranged, but the other points are substantially different. There is no difference. That is, the second inspection method differs from the first inspection method in the secondary inspection step. Therefore, the explanation of the second inspection method will mainly explain the secondary inspection process that is different from the first inspection method, and the other contents that are not substantially different from the first inspection method will be duplicated. Omit.

In the second inspection method, as in the first inspection method, the primary inspection step is performed using the main probe 11 (FIG. 5), and then the presence or absence of the defect D is determined in the primary inspection step. A secondary inspection step is performed on the undetermined inspection points that could not be completed.

In the secondary inspection step in the second inspection method, as a second surface having a positional relationship non-parallel to the first surface on which the main probe 11 is arranged, a side surface (front surface or) non-parallel to the joint surface P is used. Select the back surface) and place the auxiliary probe 12 (FIGS. 6 and 7), and not from the auxiliary probe 12 placed on the second surface that is non-parallel to both the first surface and the joint surface P. Ultrasonic waves are transmitted toward the judgment inspection point and the reflected echo from the unjudgment inspection point is received. In the second inspection method, ultrasonic waves can be transmitted to an undetermined inspection point in the joint surface P, which is different from the first surface on which the main probe 11 is arranged and is in a range where direct flaw detection is not possible. The point that the surface is set as the second surface is the same as that of the first inspection method.

The auxiliary probe 12 may be a monocular probe or a linear array probe in which a transmitting side probe 12t as an ultrasonic transmitting means and a receiving side probe 12r as an ultrasonic receiving means are integrally configured (Fig.). 6) A set (two) of a monocular probe or a linear array probe in which the transmitting side probe 12t and the receiving side probe 12r are individually configured may be used (FIG. 7).

Similar to the primary inspection step, the signal detecting means 15 (omitted in FIG. 5) determines whether or not the received reflected echo is a scattered wave S, and the received reflected echo is defective based on the determination result. Determine if D exists. Subsequent steps are the same as in the first inspection method.
obtain.

[Third inspection method]
8 to 11 are explanatory views showing an outline of a third inspection method which is an example of the ultrasonic inspection method according to the embodiment of the present invention.

The content of the secondary inspection step of the third inspection method is different from that of the first inspection method, but the other steps are not substantially different. Therefore, in the description of the third inspection method, duplicate description will be omitted with respect to the points that are not substantially different from the first inspection method.

In the third inspection method, as in the first inspection method, the primary inspection step was performed using the main probe 11, and then the presence or absence of the defect D could not be determined in the primary inspection step. A secondary inspection step is performed on the undetermined inspection points.

In the secondary inspection step in the third inspection method, ultrasonic waves are transmitted from the main probe 11 arranged on the first surface, and the ultrasonic waves are once reflected by the ultrasonic obstruction part 5 and then of the joint surface P. A reflection echo (hereinafter referred to as "multiple reflection echo") is generated by reaching an undetermined inspection point in the range where direct flaw detection is not possible, and a multiple reflection echo from the undetermined inspection point is received.

That is, unlike the first and second inspection methods, the third inspection method uses the main probe 11 arranged on the first surface used in the primary inspection step to propagate the incident ultrasonic waves. By changing the route to a route different from the primary inspection process that directly faces the joint surface P in the non-detectable range via the ultrasonic obstruction part 5, the presence or absence of defect D in the primary inspection process is set. It is possible to aim at an undetermined inspection point that is different from the inspection point that determines.

In the third inspection method, a monocular probe or a linear array probe can be applied as the main probe 11 (FIGS. 8 to 11). For example, when the monocular probe is applied as the main probe 11, a single monocular probe may be applied in combination as the transmitting side main probe 11t and the receiving side main probe 11r (FIG. 8). The (two) monocular probes can be applied separately to the transmitting side main probe 11t and the receiving side main probe 11r (FIG. 9).

When the linear array probe is applied as the main probe 11, a single linear array probe may be used as both the transmitting side main probe 11t and the receiving side main probe 11r (FIG. 10). A plurality of piezoelectric elements 21 (when n = 16), such as 16 pieces, which are built in one linear array probe, form a group of the first half and a group of the second half of the piezoelectric elements 21_1 to 21_8. The piezoelectric elements 21_9 to 21_16 are divided into two groups. For example, the piezoelectric elements 21_9 to 21_16 in the latter half are used as the transmitting side main probe 11t, and the piezoelectric elements 21_1 to 21_8 in the first half are used as the receiving side main probe 11r. Can be applied as (FIG. 11).

In order to focus the ultrasonic waves at the focal point F, a delay time is required to shift the timing of exciting the voltage to the piezoelectric element 21 built in the main probe 11. The delay time is determined by the delay time calculation unit 142 (FIG. 1) of the drive element control means 14 with the main probe 11 (transmitting side main probe 11t and receiving side main probe 11r), which are known information. Relative positional relationship with the joint block material 1 (part of the block material 2), incident angle or focal position of ultrasonic waves, surface shape of the joint block material 1 (part of the block material 2), ultrasonic propagation in the joint block material 1 It is calculated using the shape and size of the ultrasonic wave blocking portion 5 that inhibits the ultrasonic wave, and the sound velocity of the acoustic contact medium 7 and the bonding block material 1 (the portion of the block material 2).

Regarding the information on the shape and size of the ultrasonic obstruction portion 5, for example, when the joint block material 1 to be inspected is manufactured based on a drawing for manufacturing, the data of the drawing is input. Can be obtained at. It can also be obtained by calculating using the flight time of ultrasonic waves transmitted and received from the main probe 11.

Information on the surface shape of the joint block material 1 can be obtained by inputting the data of the drawing, for example, when the joint block material 1 to be inspected is manufactured based on a drawing for manufacturing. Can be done. It can also be obtained by measuring using a surface shape measuring means such as a camera or a laser range finder.

When the delay time is calculated or input so that the undetermined inspection point becomes the focal point F, ultrasonic waves are transmitted from the main probe 11 (transmitting side main probe 11t) and reflected once to the ultrasonic obstruction unit 5. Then, the focal point F is reached and the multiple reflection echo from the focal point F is received by the main probe 11 (reception side main probe 11r).

Similar to the primary inspection step, the received reflected echo determines whether or not the reflected echo received by the signal detecting means 15 (omitted in FIGS. 8 to 11) is a scattered wave S, and based on the determination result. It is determined whether or not the defect D exists. Subsequent steps are the same as in the first inspection method.

The step of focusing the ultrasonic waves on the focal point F is used in the secondary inspection step of the third inspection method described above in a form of being reflected once by the ultrasonic obstruction portion 5 when inspecting an undetermined inspection point. Is not necessarily limited to the above case.

For example, in the primary inspection step of the third inspection method and the primary inspection step and the secondary inspection step of other inspection methods, it is applied when inspecting an inspection point that can be aimed at without being reflected once by the ultrasonic wave blocking portion 5. You can also do it. The step of focusing the ultrasonic waves can further increase the intensity of the ultrasonic waves reaching the joint 4 when the intensity of the obtained reflected echo is weak, and can further increase the intensity of the obtained reflected echo.

FIG. 12 is an explanatory view showing a preferable example of the ultrasonic inspection method according to the present embodiment including the step of focusing ultrasonic waves, and is a partially enlarged view of the joint block 1 in the vicinity of the joint portion 4.

The joining block material 1 illustrated in FIG. 12 is configured by joining the other member 3 with the block material 2 with an inclusion 8 such as a thin metal plate or resin sandwiched between them. When the joint portion 4 in which the first joint portion 4a on the block material 2 side and the second joint portion 4b on the other member 3 side are formed with respect to the inclusions 8 is present in the joint block material 1. The first joint portion 4a may become a strong reflection source and it may be difficult for ultrasonic waves to propagate to the second joint portion 4b.

If the intensity of the reflected echo from the second junction 4b cannot be obtained to the extent that the presence or absence of the defect D can be determined with sufficient accuracy, the incident ultrasonic wave (incident wave T) is sent to the second junction 4b. By focusing, the intensity of the reflected echo (specular reflected wave R) from the second junction 4b can be increased.

In addition, the example shown in FIG. 12 is a joint portion 4 having one inclusion 8, that is, two different joint portions 4a and 4b, but even when there are two or more inclusions 8, the inclusions 8 are present. It is the same as the case of one.

As described above, according to the above-mentioned ultrasonic inspection apparatus and ultrasonic inspection method, a part of the inspection points set on the joint surface P due to the presence of the ultrasonic obstruction portion 5 inside as in the joint block material 1 (not yet). Even for inspection objects that cannot be directly reached by ultrasonic waves at the judgment inspection point), the reflected echo from the unjudgment inspection point can be obtained and inspected, so the inspectable range should be broadened. Can be done.

Further, according to the ultrasonic inspection apparatus 10 and the third ultrasonic inspection method, the undetermined inspection is performed using the same main probe 11 as in the primary inspection step, that is, without adding the auxiliary probe 12. Since multiple reflection echoes from points can be obtained and inspected, the range that can be inspected with a small number of ultrasonic probes can be broadened.

Further, according to the ultrasonic inspection apparatus 10 and the ultrasonic inspection method including the step of focusing the ultrasonic waves, when the intensity of the obtained reflected echo is weak, the intensity of the ultrasonic waves reaching the joint 4 can be further strengthened. It is possible to increase the intensity of the obtained reflected echo.

The present invention is not limited to the above-described embodiment as it is, and can be implemented in various forms other than the above-described embodiment at the implementation stage. The present invention can be omitted, added, replaced, or modified in various ways without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Joint block material (object to be inspected), 2 ... Block material, 3 ... Other member, 4 ... Joint part, 4a ... First joint part, 4b ... Second joint part, 5 ... Ultrasonic obstruction part, 7 … Acoustic contact medium, 8… inclusions, 10… ultrasonic inspection device, 11… main probe (ultrasonic probe: ultrasonic transmitting / receiving means), 11t… transmitting side main probe (ultrasonic transmitting means) , 11r ... Receiving side main probe (ultrasonic receiving means), 12 ... Auxiliary probe (ultrasonic probe: ultrasonic transmitting and receiving means), 12t ... Transmitting side auxiliary probe (ultrasonic transmitting means), 12r ... Receiving side auxiliary probe (ultrasonic receiving means), 13 ... Signal generating means, 14 ... Driving element control means, 141 ... Control signal generating unit, 142 ... Delay time calculation unit, 15 ... Signal detecting means, 16 ... Imaging information generation means, 17 ... probe gate, 18 ... transport means, 21 (21_1 to 21_n, 21_1 to 21_m) ... piezoelectric element, D ... defect, F ... focus, P ... junction surface, R ... mirror surface reflected wave (Normal reflected wave), S ... Diffuse reflected wave (scattered wave), T ... Incident wave.

Claims (9)

Three or more surfaces that are provided with ultrasonic wave blocking portions having different acoustic impedances inside, and have a joint surface, a facing surface facing the joint surface without having a side in contact with the joint surface, and a side in contact with the joint surface. An ultrasonic inspection device that ultrasonically detects the inside of a joint block material having a block material having a non-opposing surface and another member joined to the joint surface of the block material.
At least one ultrasonic wave transmitting / receiving means configured to be able to transmit ultrasonic waves from the first surface, which is one of the non-opposing surfaces, which is a predetermined surface.
A range that is set on the joint surface and can be directly detected from the first surface using the ultrasonic transmitting / receiving means, and a range that can be directly detected from the first surface due to the presence of the ultrasonic obstructing portion. A flaw detection range setting means that can set information on a range that cannot be detected directly using a sound wave transmitting / receiving means,
Propagation path changing means for setting a propagation path so that the ultrasonic waves transmitted from the ultrasonic wave transmitting / receiving means are directed to the directly non-detectable range, and
An ultrasonic inspection device characterized by comprising. Three or more surfaces that are provided with ultrasonic wave blocking portions having different acoustic impedances inside, and have a joint surface, a facing surface facing the joint surface without having a side in contact with the joint surface, and a side in contact with the joint surface. An ultrasonic inspection device that ultrasonically detects the inside of a joint block material having a block material having a non-opposing surface and another member joined to the joint surface of the block material.
At least one ultrasonic wave transmitting / receiving means configured to be able to transmit ultrasonic waves from the first surface, which is one of the non-opposing surfaces, which is a predetermined surface.
A range that is set on the joint surface and can be directly detected from the first surface using the ultrasonic transmitting / receiving means, and a range that can be directly detected from the first surface due to the presence of the ultrasonic obstructing portion. A flaw detection range setting means that can set information on a range that cannot be detected directly using a sound wave transmitting / receiving means, and a flaw detection range setting means that cannot detect a flaw directly.
Another ultrasonic transmitting / receiving means configured to be able to transmit the ultrasonic waves from the facing surface of the block material to the joint surface in the range where direct flaw detection is not possible.
An ultrasonic inspection device characterized by comprising. The propagation path changing means is such that the ultrasonic waves from the ultrasonic wave transmitting / receiving means are reflected from the first surface of the block material by the ultrasonic wave blocking portion and then directed toward the joint surface in the direct flaw detection range. The ultrasonic inspection apparatus according to claim 1, which is an incident condition setting means for setting an incident position and an incident angle of the ultrasonic wave on the block material. The ultrasonic wave transmitting / receiving means is provided with a plurality of piezoelectric elements, and also includes a driving element controlling means for selectively driving each of the piezoelectric elements based on a delay time obtained in advance.
The propagation path changing means calculates the delay time such that the ultrasonic waves transmitted from the ultrasonic transmission / reception means are reflected by the ultrasonic wave blocking portion and then focused on the joint surface in the direct flaw-detectable range. The ultrasonic inspection apparatus according to claim 1, which is a time calculation unit. Three or more surfaces that are provided with ultrasonic wave blocking portions having different acoustic impedances inside, and have a joint surface, a facing surface facing the joint surface without having a side in contact with the joint surface, and a side in contact with the joint surface. This is an ultrasonic inspection method for ultrasonically detecting a block material having a non-opposing surface and a joint block material having another member joined to the joint surface of the block material.
A selection step of selecting one of the non-opposing surfaces of the block material as the first surface, and
The first is because the joint surface has a direct flaw-detectable range in which ultrasonic waves can be directly detected by using an ultrasonic transmitting / receiving means configured to transmit ultrasonic waves from the first surface, and the ultrasonic wave blocking portion. A flaw detection range setting step of setting a direct flaw detection impossible range in which direct flaw detection is not possible using the ultrasonic transmitting / receiving means from the first surface, and a flaw detection range setting step.
At least one ultrasonic wave transmitting / receiving means is arranged on the first surface, and ultrasonic waves are directly transmitted from the ultrasonic wave transmitting / receiving means to the directly flaw-detectable range of the joint surface to transmit the ultrasonic waves directly to the joint surface. The primary inspection process, which inspects the range that can be directly detected, and
A propagation path different from that of the primary inspection step is set so that the ultrasonic waves face the direct flaw-detectable range of the joint surface, and the ultrasonic waves are transmitted by the ultrasonic transmission / reception means to directly the joint surface. An ultrasonic inspection method comprising a secondary inspection step of inspecting a non-detectable range. The ultrasonic inspection method according to claim 5, wherein in the secondary inspection step, another ultrasonic transmission / reception means is arranged on the facing surface of the block material and then transmitted to the direct flaw detection impossible range of the joint surface. In the secondary inspection step, after the ultrasonic waves are reflected by the ultrasonic wave blocking portion from the ultrasonic wave transmitting / receiving means arranged on the first surface of the block material, the ultrasonic waves are directed to the joint surface in the non-direct flaw detection range. The ultrasonic inspection method according to claim 5, wherein the ultrasonic inspection method is transmitted. The ultrasonic wave transmitting / receiving means is provided with a plurality of piezoelectric elements, and is configured to selectively drive each of the piezoelectric elements based on a delay time obtained in advance.
In the secondary inspection step, the ultrasonic waves transmitted from the ultrasonic wave transmitting / receiving means arranged on the first surface are reflected by the ultrasonic wave blocking portion and then focused on the joint surface in the range where direct flaw detection is not possible. The ultrasonic inspection method according to claim 5, wherein the delay time is calculated as described above. Acoustic impedance inside a block material having a joint surface, a facing surface facing the joint surface without having a side in contact with the joint surface, and three or more non-opposing surfaces having a side in contact with the joint surface. An ultrasonic inhibition part forming step of forming different ultrasonic inhibition parts, and
A joining step of joining another member to the joining surface of the block material,
A selection step of selecting one of the non-opposing surfaces of the block material as the first surface, and
The first is because the joint surface has a direct flaw-detectable range in which ultrasonic waves can be directly detected by using an ultrasonic transmitting / receiving means configured to transmit ultrasonic waves from the first surface, and the ultrasonic wave blocking portion. A flaw detection range setting step of setting a direct flaw detection impossible range in which direct flaw detection is not possible using the ultrasonic wave transmitting / receiving means from the first surface, and a flaw detection range setting step.
After the joining step, at least one ultrasonic transmitting / receiving means is arranged on the first surface, and ultrasonic waves are directly transmitted from the ultrasonic transmitting / receiving means to the directly flaw-detectable range of the joining surface. In the primary inspection step of inspecting the directly flaw-detectable range of the joint surface,
After the joining step, a propagation path different from that of the primary inspection step is set so that the ultrasonic waves face the direct flaw-detectable range of the joining surface, and the ultrasonic waves are transmitted by the ultrasonic transmitting / receiving means. A method for producing a joint block material, which comprises a secondary inspection step of inspecting the joint surface in a range in which the direct flaw cannot be detected.

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