JPS6228867B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic ultrasonic flaw detection device using two probes for inspecting a welded portion between a column and a beam, for example. Such automatic ultrasonic flaw detection equipment emits ultrasonic waves from a transmitting probe, receives echoes from the welded part, and analyzes the echoes to determine whether or not the welded part passes, and can be applied to various inspections of welded parts. (See, for example, Japanese Patent Laid-Open No. 48-66486). A technique for moving a transmitting probe and a receiving probe in opposite directions in order to continuously inspect a welded portion is disclosed in, for example, Japanese Utility Model Application No. 51-135585. However, although such known techniques can continuously detect defects in the vertical direction of the weld, the entire apparatus must be moved in the width direction each time. Furthermore, if a defect occurs, it cannot be recorded, so it is necessary to mark each time with a marker or the like, for example. To this end, Japanese Patent Application Laid-Open No. 1985-85291 discloses a technique for recording the defect position on recording paper in conjunction with a probe. However, in such known technology, determination of a defective echo requires two requirements: the height of the echo and the distance to the defective part, and flaw detection scanning requires scanning in two directions: the left-right direction and the front-back direction. In total, four pieces of information were obtained from which defects had to be determined. For this reason, according to the prior art, when automation is performed, the manner of data processing and recording has to become complicated. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic ultrasonic flaw detection device that uses two probes and can identify defects only by back-and-forth scanning and echo height, thereby facilitating automation. According to the present invention, a transmitting probe is arranged on one side of the base material and transmits an ultrasonic beam toward the interface between the base metal and the weld, and a transmitting probe is arranged on the other side of the base material and hits the interface. a receiving probe that receives the ultrasonic beam reflected by the base material; a moving device that moves the transmitting probe and the receiving probe at a constant speed along each side of the base material; The recorder is equipped with a recorder that has a recording paper that is fed in a fixed relationship with the moving speed of the flaw detector, and the recorder outputs the value of the maximum echo height expressed on the cathode ray tube of the flaw detector as a digital quantity and integrates it. It is linked to the value. Therefore, when the probe is moved so that the ultrasonic beam from the transmitting probe covers the welded part, a defect echo with the height caused by the defect is recorded on the recording paper, and a defect echo is recorded on the brush tube. The defect cross-sectional area can be determined by converting the expressed maximum echo height into a digital value, calculating the integral value with the length, and linking it to the recording paper. Therefore, defects can be easily identified and automation can be easily achieved, improving work efficiency. Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, a column A and a base material, such as a beam B, are fixed together by a weld C.
T is the interface between base metal B and weld C. The transmitting probe 1 and the receiving probe 2 are coupled by an interlocking jig 3 so as to be interlockable. A fixed shaft 4 is protruded from the transmitting probe 1, and a fixed shaft 5 is protruded from the receiving probe 2. Reference numeral 6 denotes a central axis, which is fixed at a predetermined position on the surface of the base material B by a fixing device such as a magnet. First links 7 and 8 are swingably provided around a central axis 6, second links 9 and 10 are swingably provided around a fixed shaft 4 protruding from the transmitting probe 1, Second links 11 and 1 are swingable around a fixed shaft 5 protruding from the receiving probe 2.
2 is provided, and an interlocking jig is constructed by pivotally connecting the tips of the first links 7 and 8 and the tips of the second links 9, 10, 11, and 12.
By this mechanism, the transmitting probe 1 and the receiving probe 2 can be moved equidistantly in opposite directions along each side of the base material B. 13 is a flaw detector recorder. A synchronous motor 14 is fixed to the surface of the base material B by a magnet 15, and a gear 16 is provided on the shaft of the synchronous motor 14. The probe moving device is shown in FIGS. 3 to 5. 3 is a cross-section in FIG. 2, FIG. 4 is a cross-section in FIG. 2, and FIG. 5 is a cross-section in FIG. Frame 17 of the probe moving device
is fixed to the base material B by a fixing magnet 18. A rotating shaft 19 is provided near the end of the frame 17, a wheel 20 that meshes with the gear 16 is provided at one end of the rotating shaft 19, and a guide roller 21 is provided at the other end. Guide rollers 22, 2 are installed near the other end of the frame 17.
3 will be provided. In FIG. 4, an endless wire 24 is fixed to the transmitting probe 1, and a spring 25 provided between the transmitting probe 1 and the frame 17 causes the transmitting probe 1 to be attached to the side surface of the base material B. A bearing 26 is interposed between the spring 25 and the frame 17. When the gear 16 rotates, the wheel 20 that meshes with the gear 16 rotates, and the wire 24 moves, so the transmission probe 1 moves along the side surface of the base material B. 27 is a screw for adjusting the height of the frame 17 (therefore, the transmitting probe 1). Since the automatic ultrasonic flaw detection apparatus of the present invention is configured as described above, the flaw detection operation of the welded portion is performed in the following steps. First, the frames 17 of the probe moving device are attached to both sides of the base material B using magnets 18. A probe interlocking jig 3 is installed on a base material B, a transmitting probe 1 and a receiving probe 2 are attached to both ends of the jig 3, and a wheel 20 and a gear 16 are engaged. Transmission probe 1
The moving speed of the synchronous motor 14, that is, the rotational speed of the synchronous motor 14 and the feeding speed of the recording paper are linked.
As shown in Figure 6, the interface T between base metal B and weld C
When the ultrasonic beam 28 is emitted from the transmitting probe 1 at a certain angle toward the boundary surface T
and is reflected by the receiving probe 2 and received by the receiving probe 2.
When the transmitting probe 1 is moved at a constant speed, the receiving probe 2 is moved by the interlocking jig 3 by the same distance in the opposite direction to the transmitting probe 1, and the reflection position of the ultrasound beam changes. In this way, when the probe moves so that the ultrasonic beam transmitted from the transmitting probe 1 covers all the welding parts C from one end of the welding part C to the other, the moving speed of the transmitting probe 1 The recording paper 29, which is fed in a certain interlocking relationship, has a diagram C showing defect echoes from the flaw detection start point a to the flaw detection end point b.
is drawn. d ₁ , d ₂ , d ₃ , and d ₄ are defective parts in the weld section. In the recording paper 29, the defective echo height h ₁ is due to the defective portion d ₁ , and the height h ₂
are caused by the defective parts _d1 and _d2 , and _h3 ... _h6 are the defect echo heights corresponding to the defective parts, respectively. The area surrounded by line C showing the defect echo and the horizontal axis indicates the defect cross-sectional area of the weld. In the present invention, the probe is moved at a constant speed, and a constant interlocking relationship is maintained between the moving speed of the probe and the feeding speed of the recording paper, so flaw detection scans only require forward and backward scanning.
In addition, defect echoes can be determined only on the vertical axis (echo height), and defects can be determined based on a total of two pieces of information, making it easy to automate ultrasonic flaw detection. In a certain interlocking relationship between the probe and the recorder, the value of the maximum echo height appearing on the cathode ray tube of the flaw detector is output as a digital quantity, and its integral value is interlocked with the recorder. FIGS. 7 and 8 show a second embodiment of the present invention, and parts that are unchanged from the first embodiment are designated by the same reference numerals. The length of the gear 30 provided on the shaft of the synchronous motor 14 has the length of the maximum movement range of the transmitting probe 1. The transmitting probe 1 is provided with an interlocking section 31 which meshes with a gear 30 and is movable in the left-right direction as the gear 30 rotates. Interlocking part 31
A fixed shaft 4 is provided protruding from the upper surface of. FIGS. 9 and 10 show a third embodiment of the present invention, and parts that are unchanged from the first embodiment are designated by the same reference numerals. Synchronous motor 32 on the surface of base material B
A gear 33 is attached to the shaft of the synchronous motor 32. Gear 34 meshing with gear 33
A pulley 35 is provided on the shaft, and wires 36, 3
7 to rotate the pulleys 38 and 39 to move the transmitter probe 1 and the receiver probe 2 along the side surface of the base material B. As described above, according to the present invention, since the integral value is determined from the maximum echo height value and linked to the recording paper, the defect cross-sectional area can be known, the defect can be easily determined, and automation is easy. will be achieved.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a partial sectional view taken along the line - in FIG. 2, and FIG. 4 is a partial sectional view taken along the line - FIG. 5 is a partial cross-sectional view taken along the - line, FIG. 6 is a line diagram showing the weld section and the corresponding defect echo on the recording paper, and FIG. 7 is a diagram showing the present invention. A plan view of the second embodiment of
FIG. 8 is a side view thereof, FIG. 9 is a plan view of a third embodiment of the present invention, and FIG. 10 is a side view thereof. A...Column, B...Base metal, C...Welded part, T...Boundary surface,
1... Transmission probe, 2... Receiving probe, 3 ... Interlocking jig, 7, 8... First link, 9, 10, 11, 12
...Second link, 13...Flaw detector recorder, 14...Synchronous motor, 24...Wire, 27...Will,
28...Ultrasonic beam, 29...Recording paper, 30...Gear, 31...Interlocking part, 36, 37...Wire, C...
Diagram showing defect echoes, d ₁ , d ₂ , d ₃ , d ₄ ... defect portion, h ₁ , h ₂ , h ₃ , h ₄ , h ₅ , h ₆ ... defect echo height.

Claims (1)

[Claims] 1. A transmitting probe placed on one side of the base metal to transmit an ultrasonic beam toward the interface between the base metal and the weld, and a transmitting probe placed on the other side of the base metal to transmit ultrasonic waves that hit the interface and reflect. a receiving probe that receives the beam; a moving device that moves the transmitting probe and the receiving probe at a constant speed along each side of the base material; The recorder is equipped with a recorder that has a recording paper that is fed in an interlocking relationship, and the recorder outputs the value of the maximum echo height represented on the cathode ray tube of the flaw detector as a digital quantity and interlocks with the integrated value. An automatic ultrasonic flaw detection device that uses two probes.