JPS5919793B2 - electro gas welding method - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrogas welding method, in which the entire length of the welded part and the penetration on the left and right sides are made uniform, and as the welding progresses, the welding machine and the copper dowel following these are operated at an appropriate speed. It is an object of the present invention to provide a welding method in which welding conditions can be controlled to increase the welding conditions.

In electro gas welding, in order to ensure the quality of the welded part, the entire length of the welded part and the amount of penetration on the left and right sides and front and back sides are made uniform, and as with other welding methods, the welding machine and copper dowel must be operated at appropriate speeds as welding progresses. You need to move it. Conventionally, as a method to ensure such a requirement, the uniformity of the penetration was determined by visually observing the difference between the right and left and front and back sides of the red-hot area that occurs around the welding part due to welding heat, and
When the red-hot state differs between the left and right sides and the front and back sides, the welding wire has been moved left and right or front and back, which is an extremely complicated and inefficient operation, in order to equalize the penetration depth.

In addition, in order to raise the welding machine and blunt welding metal as welding progresses, point the photoelectric receiving element at the welding area from the outer blade.
A force method has been adopted in which the progress of welding is detected by this, and the rising speed is determined in accordance with the result of this detection. However, this method has the disadvantage that it is difficult to make delicate angle adjustments of the photoelectric light-receiving element according to the thickness of the base material, and it is difficult to obtain an accurate rising speed. The present invention was created as a result of repeated research to eliminate the above-mentioned drawbacks of the conventional technology, and the embodiments thereof will be explained with reference to the drawings. This figure shows the copper dowels 2a and 2b used in the welding process, and how they are attached to the base metals 1 and 1'. 2a and 2b are grooves 3
The base metal 1 is sandwiched between the copper dowels 2a, which are placed on both sides and slide upward along the groove 3 as welding progresses.
Shielding gas is constantly supplied from an opening (not shown) at the top of 2b, and a molten pool 6 is formed between the copper pads 2a and 2b.

In other drawings, 5 is a weld metal. In the present invention,
A detection element 7 for detecting light or heat is provided on the copper pads 2a and 2b.
The detection element 7 may be a photoelectric element or a thermoelectric element, but in this embodiment, it is constructed as a thermoelectric element.

The basic configuration of the present invention is that, of a pair of copper butts on both sides of the base metal, one of the copper butts is provided with a plurality of detection elements or a group of detection elements at a predetermined positional relationship on the left and right with respect to the welding progress direction. buried,
Further, a detection element or a detection element group is buried in the copper pad on the other side so as to face at least one of the plurality of detection elements or detection element groups with the base material in between,
In contrast to this basic configuration, in this embodiment, the copper pad 2 on one side is
A pair of seven groups of detection elements that are symmetrical with respect to the groove position are buried in the copper dot 2b on the other side, and seven groups of detection elements buried in the copper dot 2a on one side are buried in the copper dot 2b on the other side. Seven groups of left-right symmetrical detection elements are buried in positions corresponding to the left and right sides.

Each of the above detection element 7 groups is composed of four detection elements 7 adjacent to each other in the left and right direction. Hereinafter, in this embodiment, among the seven groups of detection elements provided on the copper pad 2a on one side, the right side is 7R, the left side is 7L, and among the group of detection elements provided on the copper pad 2b on the other side, the The element facing the detection element 7R will be referred to as 7RI3, and the element facing the detection element 7L will be referred to as 7L'. In this embodiment, the detection elements 7R, 7L, 7d, and 7L' are buried so as to be located at the level of the molten pool 6, respectively.

Further, a heat-resistant protection plate 9 (made of quartz or the like, for example) is attached to the front surface of each detection element 7 to protect each detection element 7 from the direct heat of the welding part. Note that the number of detection elements 7 or 7 groups of detection elements, their arrangement, and 7 groups of detection elements constituting the detection element group are not limited to the above embodiments.
For example, it may be as shown in FIG. 4A, b or FIG. 5A, b.

FIG. 6 schematically shows the copper dowels 2a, 2b, a welding machine and its control mechanism, in which 8 is a welding torch, 10
11 is a drive motor for positioning the welding torch 8 in the direction of the opposing surfaces of the base metals 1 and 11; 12 is the welding torch 8; This is a drive motor for adjusting the position of the base material 1, 1' in the thickness direction.

According to the above configuration, the electric signal from the detection element 7 embedded in the copper pads 2a, 2b is input to the determination device 13, which includes a differential amplifier, etc., and each deviation signal obtained here is The power is supplied to the moving motor 10, the drive motors 11 and 12 of the welding torch 8, and the welding voltage control device 14, thereby controlling the position adjustment of the base material 1 of the welding torch 8 in the force direction of the opposing surface. Base material 1, “Position adjustment leg in the thickness direction, welding machine voltage control, welding machine and copper dowel 2a
, 2b, which performs the rising speed crawler. Next, a specific control example based on the above configuration will be shown below.

FIG. 7 shows welding voltage control to ensure uniform welding length and left and right penetration, and base materials 1, 1 of welding torch 8! This shows an example of position adjustment control in the direction of the opposing surface, and in this embodiment, left and right detection elements 7R and 7L are used. In the figure, 15A, 15B and 15C are adders;
16A and 16B are differential amplifiers, 17 is a welding voltage control circuit, 18 is a drive control circuit for the drive motor 11, and 20A is a setting device. According to this control example, the signals of the left and right detection elements 7R and 7L are first added by the adders 15A and 15B, and this added signal is input to the differential amplifier 16A to obtain a signal corresponding to the deviation thereof. . This deviation signal is supplied to the drive leg circuit 18 to control the drive motor 11, thereby controlling the position of the welding torch 8 in the direction of the surface facing the base metal. The left and right addition signals are further added by the adder 15C, and this addition signal is input to the differential amplifier 16B, so that the appropriateness given in advance by the setting device 20A corresponds to the deviation from the reference signal of the amount of heat. A signal is required.

The welding voltage is controlled by supplying this deviation signal to the welding voltage support circuit 17. FIG. 8 shows an example of position adjustment control of the welding torch 8 to ensure uniform penetration in the thickness direction of the base metal 1, 1.
In this embodiment, detection elements 7R and 7R' facing each other with the base material 1 in between are used.

In the figure, 15D and 15E are adders, and 16C is a differential amplifier 19 which is a drive control circuit.

According to this control example, the signals from the detection elements 7R and 7RI are added by the adders 15D and 15E, and this added signal is input to the differential amplifier 16C to obtain a signal corresponding to the deviation thereof. By supplying this deviation signal to the drive control circuit 19, the drive motor 12
Drive control is then performed, thereby controlling the position of the welding torch 8 in the thickness direction of the base materials 1 and 17. FIG. 9 shows a control example of the rising speed control of the welding machine and the copper pads 2a, 2b. In this embodiment, the left and right detection elements 7
R and 7L are used.

In the figure, 21 is a peak hold, 16D is a differential amplifier, 20B is a setting device, and 22 is a drive control circuit for the trolley moving motor 10. According to this control example, when the electrical signals of the detection elements 7R, 7L0) are input to the peak hold 21, a signal corresponding to the peak temperature value is supplied from the peak hold 21 to the differential amplifier 16D, and the differential amplifier 16D The amplifier 16D obtains a signal corresponding to the deviation from a reference signal of an appropriate amount of heat given in advance by the setting device 20B. This deviation signal is then transmitted to the drive Fhl leg circuit 22.
The motor 10 for moving the trolley is controlled by being supplied to the welding machine and the copper dowels 2a, 2.
The rising speed of b is controlled. The operation of the above control system will be explained in more detail. First, regarding the position adjustment control of the base material 1 of the welding torch 8 in the opposing surface force direction, if the left and right penetration of the base material 1 is uneven, the left and right detection elements 7R,
There is a difference in the amount of heat received by the differential amplifier 16A.
For example, when the output is positive, the penetration is biased toward the base material 1, and when the opposite is true, the penetration is biased toward the base material 1! The drive control circuit 18, which receives the output of the differential amplifier 16A manually, drives the drive motor 11 so that the output becomes zero, and the base metal 1 of the welding torch 8 17. Adjust the position in the force direction of the opposing surface. As a result, uniform penetration of the left and right base materials 1, 1' is always ensured. Regarding the welding voltage, when the penetration of the weld is in a certain state, the total amount of heat received by the left and right detection elements 7R and 7L is always constant, so in this case, For example, when the output of the differential amplifier 16B is positive, if a reference signal corresponding to the amount of heat that the detection elements 7R and 7L should receive when proper penetration is ensured by the setting device 20A is applied. The welding voltage control circuit 17 is connected to the differential amplifier 16B.
The welding voltage is controlled so that it becomes zero when it receives the output of

As a result, uniform penetration over the entire length of the weld is ensured.
Furthermore, base material 1,1! Regarding the position adjustment control of the welding torch 8 in the thickness force direction, the base metal 1, ``If the penetration in the thickness force direction is uneven, Therefore, when the output of the differential amplifier 16C is positive, the penetration is biased toward the copper pad 2a, and when the opposite is true, the penetration is biased toward the copper pad 2b. When the drive control circuit 19 receives the output of the differential amplifier 16C as an input, it drives the drive motor 12 so that the output becomes zero, and the base metals 1, 1! of the welding torch 8. Adjust the position in the direction of the opposing surface.

As a result, base material 1,1! Uniform penetration in the thickness direction is always ensured. Next, regarding the rising speed control of the welding machine and the copper dots 2a, 2b, when the copper dots 2a, 2b are rising synchronously with the welding part (molten pool 6 in this example), the detection elements 7R, 7L are Therefore, in this case, the copper butts 2a and 2 are controlled by the setting device 20B.
If a reference signal corresponding to the amount of heat that the detection elements 7R and 7L should receive when the detection elements 7R and 7L are in a proper position relative to the welding part is given, for example, when the output of the differential amplifier 16D is positive, the copper dowel 2a , 2b are in a lagging state with respect to the welding part, and in the opposite case, they are in a leading state.
When the output of D is received as an input, the speed of the motor 10 for moving the bogie is increased or decreased so that the output becomes zero.

As a result, the welding machine and the copper dowels 2a, 2b rise while always maintaining a certain predetermined corresponding position with respect to the welding part.
According to the electrogas welding method according to the present invention as described above, the heat or light of the welding part is detected by the detection element embedded in the copper pad with a predetermined positional relationship, and based on the detection result, The position adjustment control of the welding torch, the welding voltage creep, and the rising speed control of the welding machine and copper dowel can be controlled at the same time, thereby making the entire length of the welding part and the penetration on the left and right front and back sides uniform. In addition, the welding machine and the copper dot can be raised at an appropriate speed as welding progresses, making it possible to obtain a properly uniform welded area. This has the excellent effect of greatly increasing workability in electrogas welding because it can be performed simultaneously using only the detection element embedded in the welding.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of the copper dowel used in the electrogas welding method of the present invention and its mounting state, with Figure 1 being a front view and Figure 2 being a rear view. , FIG. 3 is a side view. FIGS. 4A and 4B show other embodiments of the copper dowel, with FIG. 4A showing a front view and FIG. 4B a rear view. Fifth
Figures A and B similarly show other embodiments of the copper dowel, with Figure 5a showing a front view and Figure 5b a rear view. FIG. 6 is an explanatory diagram schematically showing an embodiment of a welding device and its control mechanism used in the electrogas welding method according to the present invention. 7 to 9 show a control system of an embodiment of the force method according to the present invention, and FIG. 7 shows a configuration program for position adjustment control of the welding torch in the direction of the surface facing the base metal and welding voltage control. 8 is a block diagram showing the configuration of controlling the position of the welding torch in the thickness direction of the base material, and FIG. 9 is a block diagram showing the configuration of controlling the ascending speed of the welding machine and copper dowel. In the figure, 1 and 11 are base metals, 2a and 2b are copper dowels, 7,
7R, 7L, 7R', 7L' are detection elements, 8 is a welding torch, 10 is a motor for moving the trolley, 1112 is a drive motor for adjusting the position of the welding torch, 15A to 15E are adders, 16A to 16D are differential amplifiers. , 17 is a welding voltage control circuit, 18 and 19 are drive control circuits for a drive motor for adjusting the welding torch position, 20A and 20B are setting devices, 2
3 is a peak hold, and 22 is a drive control circuit for a motor for moving the cart.

Claims (1)

[Claims] 1. In electrogas welding, a plurality of copper butts embedded in one of a pair of copper butts on both sides of the base metal at a predetermined positional relationship on the left and right with respect to the welding progress direction. A detection element or a group of detection elements, and a detection element or a group of detection elements buried in the copper pad on the other side so as to sandwich the base material and face at least one of the detection elements or the detection element group, An electrogas welding method characterized by detecting light or heat in a welding part and performing the following controls during welding based on electric signals corresponding to the amount of light or heat detected by each detection element. (a) A signal corresponding to the deviation of the signals from the left and right detection elements or detection element groups is obtained, and the position adjustment of the welding torch in the direction of the surface facing the base material is performed using this deviation signal. (b) Find the sum signal of the signals from the left and right detection elements or detection element groups, find the signal corresponding to the deviation between this sum signal and a preset reference signal, and use this deviation signal to control the voltage of the welding machine. . (c) A signal corresponding to the deviation of the signal by the detecting element or a group of detecting elements facing each other with the base material in between is obtained, and the position adjustment of the welding torch in the thickness direction of the base material is controlled using this deviation signal. (d) A signal corresponding to the deviation between the signal from at least one detection element or a group of detection elements and a preset reference signal is obtained, and the rising speed of the welding machine and the copper dowel is controlled using this deviation signal.