JPH04300082A - Method for controlling joining welding with measuring plate thickness - Google Patents

Abstract

PURPOSE:To control the welding condition based on the plate thickness measured value by continuously forming the welded joint so good that the penetration bead is generated on the proper position on the butt welding of the butt part of the die like column and the diagram surface with utilizing the laser beam welding equipment. CONSTITUTION:The butt joining control construction method by measuring the plate thickness that the root face dimension of the column end surface is measure by using the contactless plate thickness measuring instrument 8, etc., the thyrister controlling unit 10 is controlled by using the signal operated and processing with the input heat control device 9 based on the above signal value, the most optimum joining welding condition is decided against the root face dimension, the power of the laser is controlled or the welding speed is controlled, then the welding joint so good that the penetration bead is generated on the proper position is formed continuously.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The welding method of the present invention is used for assembling a bracket-type structure of a column beam joint that forms a joint between a steel pipe column and a beam material - welding between a column and a diaphragm - or This invention relates to a joining welding method as a preliminary process for butt welding steel plates together.

0002

[Prior art] Because the axial force, bending moment, shear stress, etc. of each member concentrate at the joint part of a column and beam, it is designed to have sufficient strength and rigidity, and the joint part of the column and beam is designed to have sufficient strength and rigidity. It is constructed to ensure safety against local failure of the column peripheral wall caused by the shear strength of the outer panels and the bending stress of the beam. The above-mentioned column beam joint materials are roughly divided into two types, depending on the joining method: fastener joints using bolts, high-strength bolts, etc., and weld joints; however, in structures using steel pipe columns, the member cross section is closed and fastener joints are applied. Since this is not easy, welding is generally adopted, and factory-welded bracket-type column beam joints meet the above conditions, and have been widely used since they have been evaluated for their workability and reliability. ing.

By the way, among the above-mentioned bracket-type pillar beam joint materials, in order to form the joint material of the beam-through type through diaphragm, conventionally,

As shown in FIG. 5, a dice-shaped member 1 is formed by cutting a steel pipe column short in the longitudinal axis direction and perpendicular to the axis.
Make groove 2 on each end face (

(see Fig. 4), then line the backing metal 7 along the inner surface of each end surface.
The root spacing is formed by tack welding 8 without any gaps, the diaphragm 5 is placed here, and the weld joint 6 is formed in the weld pocket formed between the groove of the dice-shaped column end face and the flange 5 surface. By doing this, the pillar beams and shikiguchi materials were assembled. Among the above-mentioned assembly processes, the main welding process between the column 1 and the diaphragm 5 is performed within the factory, due to the recent advances in welding robot technology.
Automation has become possible, making it possible to equalize product quality, increase precision, and improve processing efficiency.

However, it is difficult to automate the process of tack welding 8 the backing metal 7 to the column end face, which is a preliminary work for the above-mentioned main welding. In other words, if there is a gap between the backing metal 7 and the inner wall surface of the column 1, weld metal will leak during actual welding, which will have a negative impact on the quality of the welded joint 6. Because of the loose tolerance, even if the backing metal 7 of the same shape is applied to the column end face, the backing metal 7 will not come into close contact with the inner wall surface of the column. For this reason, the backing metal 7 is manually adjusted to the inner wall surface of the column using a hammer or vise while tack welding 8
It is not suitable for automation and increases man-hours and labor costs. is the current situation.

Accordingly, (1) The backing metal 7 is tack welded with the backing metal 7 protruding from the column end face by 5 mm to 10 mm to form a root gap at the edge, but manual tack welding is not possible. Backing money 7
The end faces of the diaphragm do not lie on the same plane, and a gap is created between the 5 faces of the diaphragm, which adversely affects the quality of the welded joint. Alternatively, the accuracy of assembling the pillar beams and joint materials is reduced. (2) Since the welding pocket is wide, the heat capacity of the molten metal increases, which requires a large amount of welding material, and also increases local distortion due to heating of the processed material. (3) After forming the welded joint, the gap between the backing metal 7 and the inner surface of the dice-shaped column forms a crack in the joint, which adversely affects the strength of the welded joint (

(See FIG. 6) and other problems.

[0006]Recently, therefore, a laser beam welding method has been proposed for the purpose of automatically joining and welding these types of members. In the butt joint welding method of the above-mentioned dice-shaped column end face of the pillar beam joint member and the diaphragm 5 using a laser processing machine, the diaphragm is crimped to the grooved dice opening edge while regulating the mutual position. Then, a laser beam is irradiated directly to the butt contact point between the two, and the welding is performed to the extent that back waves are generated on the inner peripheral surface of the column. A joint weld is created between the die end face and the diaphragm 5 by automatic guidance along the mating contact points. The actual welding of the weld pocket created between the two is completed by placing the prefabricated member on a known welding robot that was in practical use at the time of this application. The joining welding process described above is not difficult to automate, and the quality of the column and beam joint materials assembled based on this method is uniform, and it has high precision as it is machined. The advantage is that you can get something.

By the way, in order to perform the above-mentioned joining welding using a laser processing machine to the extent that a continuous back wave is generated on the inner surface of the dice-shaped column, it is necessary to Extremely strict thickness accuracy is required. That is, if the plate thickness is too thick relative to the laser beam output (irradiation amount), a good welded joint cannot be obtained, and if the plate thickness is too thin, melting and cutting will be performed. For example, in the case of a single-mode laser beam with a rated output of 4KW at a specific welding speed, the thickness of the groove at the end face of the die to obtain a tack welded joint under the above conditions is 2.
The limit is 0 mm to 2.5 mm.

On the other hand, thick steel plates forming columns are generally formed by hot rolling, but the thickness of such steel plates in a cross section perpendicular to the longitudinal axis is thicker at the center; The edges are thinly molded. Therefore, the wall thickness around the cross section of a one-seam rectangular steel pipe formed by bending this type of steel plate along the longitudinal axis direction is thinnest on the side where the weld line is present, and relatively thick on the opposite side. In addition, the steel plate material that forms the one-seam square steel pipe is 90% each.
Because the corner portions are formed by bending, the plate thickness at these portions is generally thicker than at other portions. The plate thickness of the cross section of the square steel pipe formed by bending the steel plate in this way is as described above, so the end face of the steel pipe column was beveled to a certain depth from the outer wall (generally, the end face of the steel pipe is beveled). It is clear that the plate thickness (dimensions of the root face) at the tip of the end face will not be constant if the plate is carried out in this way. If the dimension of this root face cannot be formed to be substantially constant, as mentioned earlier, good laser beam joining welding cannot be obtained at the relevant location.

[0009]

[Problems to be Solved by the Invention] Therefore, the method of the present invention has been proposed to butt weld the beveled end face of a one-seam square steel pipe column formed by bending a thick steel plate formed by a hot rolling method and a diaphragm. We provide a joining welding control method based on plate thickness measurement that makes it possible to perform good laser beam joining welding, and thereby (1) promote full automation of column beam joint material assembly, and (2) promote this type of joint welding. The purpose of this method is to reduce manpower from welding and (3) realize efficient assembly of uniform post beam joint materials with high precision and high quality.

0010

[Means for Solving the Problems] In order to achieve the above object, the construction method of the present invention has the following constituent elements. (1) After butt-butting the root face formed by beveling the side edge of the steel plate against the diaphragm surface, or by butt-contacting the root faces of the grooved portions of the steel plate, the abutment or butt-contact is performed. In the joining welding method using a laser beam, which connects both parts by irradiating a laser beam directly along the part and performing joining welding to the extent that a back wave is formed in the local part, ultrasonic waves etc. are not used. A laser capable of forming the joining joint according to the length of the root face dimension obtained by measuring the plate thickness near the laser beam irradiation part using a contact plate thickness measuring means and subtracting the groove dimension from the measured value. A controlled welding method for joining steel plates by measuring the mutual or plate thickness, which is characterized by joining and welding while selecting and controlling beam welding speed, output, etc. (2) The root face formed by beveling the side edge of the steel plate is brought into butt contact with the diaphragm surface, or the root faces of the steel plate grooves are brought into butt contact with each other, and then the abutment or butt contact is performed. In the joining welding method using a laser beam, which connects both parts by irradiating a laser beam directly along the part and performing joining welding to the extent that a back wave is formed in the local part, ultrasonic waves etc. are not used. Directly measure the root face wall thickness that hits the laser beam irradiation part using a contact plate thickness measuring means, and select and control the welding speed, output, etc. of the laser beam that can form the joining joint according to the measured value. A joint welding control method that involves joining and welding steel plates together or by measuring plate thickness.

[0011]

[Effect] (1) As mentioned above, the conditions for forming a good welded joint that produces continuous back waves when using laser beam welding on thin-walled materials are the thickness of the workpiece and the location in question. The permissible range of the relationship between the laser beam irradiation amount and the laser beam irradiation amount is strictly regulated. On the other hand, the thickness of each part of the thick-walled steel pipe that forms a square steel pipe column generally differs depending on the location, as mentioned above, and conventionally, the beveling process on the end face of this type of column is constant based on the outside wall of the column. Because it is applied in depth,
In the end, the dimensions of the root face formed in the end groove are the steel plate thickness minus the groove depth (constant).

[0012] Therefore, by measuring the thickness of the unbeveled steel plate near the laser beam irradiation area and subtracting the previously known beveling depth from the thickness, the beveling depth at the relevant location can be calculated. Since the root face dimensions formed based on the calculated root face dimensions can be obtained, a good joining joint can be obtained that matches the root face dimensions, i.e., produces a back wave with respect to the calculated root face dimensions. In order to adjust the amount of laser beam irradiated to the area, the laser beam welding device is equipped with means for continuously controlling the welding speed and/or laser output based on the calculated root face dimensions. do. In this way, it is possible to calculate relatively accurate root face dimensions without strictly specifying or guiding the measurement position of the steel plate thickness.

[0013] As a result, the butt tack welding technique between the column end face and the diaphragm surface, which was only able to obtain an unstable tack welded joint in the prior art, has been improved, and it is stable for any workpiece. Furthermore, we were able to develop a method that allows continuous formation of good bonded joints. After a joint weld is formed between the root face dimension of the column end face and the diaphragm surface, and the positional relationship between the dice-shaped column and the diaphragm is determined, the weld pocket formed between the two is welded by known gas welding. Alternatively, the column beam joint material can be assembled by performing main welding using electric welding or the like to form a main weld joint. In addition,
The main welding of the weld pocket described above can be performed by a known welding robot.

[0014] Of course, the above construction method involves forming grooves on both side edges of a thick steel strip, bending the steel strip along its longitudinal direction, and butt welding the groove root faces of both side edges together. A processing method in which when continuously forming a tubular member, the root faces are brought into metal contact with each other without contacting the backing metal to the back side of the weld joint, and the butt parts are joined and welded by laser beam welding. It is also applicable as In this case, since the cross section of the tubular member made of the steel strip is surrounded by a circumferential wall with no gaps, it is possible to apply sufficient forming pressure from the outer circumferential surface during tube forming, and therefore the cross-sectional shape of the steel pipe product can be accurately formed. It can be formed in accordance with the standard, and it is also possible to prevent the root faces from being misaligned. After the cross-sectional shape has been ensured in this way, the weld pocket at the joining weld line portion is filled in by main welding from the outside using a known thick-wall welding method, or by main welding from the inside and outside, respectively. The manufacturing process is no different from conventional ones.

(2) The plate thickness measurement point is the root face immediately before joining and welding, and the guidance mechanism for the measurement position of this device may be the same as the laser beam pointing direction control mechanism. In short, unless the thickness measurement direction is always kept perpendicular to the plate thickness, measurement errors will increase and good results will not be obtained. Further, in that case, it is desirable to select a groove shape such as a J-shaped groove such that a slight difference in the measurement position does not cause a large difference in the measured root face dimensions. If it is possible to directly and accurately measure the root face dimensions of the joint welding location, then based on this measurement, the welding of the butt portion between the root face and the diaphragm surface can be performed to avoid joint welding that causes continuous back waves. It is possible to control the laser beam output of the conditions. While controlling the laser beam output based on the above-mentioned measured value, it is possible to irradiate and weld the butt joint between the dice-shaped column and the diaphragm surface with the laser. The subsequent steps are the same as those described in section (1) above.

[0016]

[Example] An example of the construction method of the present invention and a mechanism for implementing the construction method will be explained below in accordance with the drawings. Since various selections can be made based on techniques known in the industry, it is not permissible to interpret the gist of the present invention in a limited manner based only on the specific structure of the members forming this embodiment without providing any particular reason. .

(Part 1) FIG. 2 is a cross-section of a main part of an example of a column joint material formed by the construction method of the present invention. Specifically, it shows a cross-section of a butt part between a dice-shaped column end face and a diaphragm. , 1 is a dice-shaped column formed by cutting a large-diameter rectangular steel pipe short and at right angles to the longitudinal axis direction, 2 is a groove surface made on the outer periphery of the end face, 3 is a root face, and 4 is a laser beam a welded joint; 5 is a diaphragm;
6 shows the actual welded joint. L indicates the laser beam irradiation direction, and the angle between the line L and the plane of the diaphragm 5 is approximately 15°.

In the figure, the dimension obtained by subtracting the groove dimension b from the plate thickness a of the steel plate forming the column 1, that is, the root face dimension t, is 2 mm to 5 mm. Before laser beam welding, the steel plate thickness a is measured in advance using a non-contact plate thickness measuring device using ultrasonic waves, etc., and the known groove dimension b is subtracted from that value to obtain the root face dimension t. At this time, unless the plate thickness measuring device is correctly applied perpendicularly to the surface of the steel plate to measure it, an error will inevitably occur. In general, the beveling depth is a known amount because a certain amount b is applied based on the outer surface of the workpiece plate thickness a. therefore,
Even when the plate thickness a changes, the root face dimension t at that time can be immediately calculated.

As mentioned above, according to the construction method of the present invention, (
1) The root face dimensions of the laser welded part are measured and calculated just before the measurement, and the welding conditions of the device are set to match the dimensions, so we can reliably and properly weld the joint locally. Can be formed. (2) Since there is no backing material, the machining accuracy of the column end face directly affects the accuracy of the parts after welding, and a highly accurate column beam joint material can be obtained. (3) Since there is no backing material, the welding pocket becomes narrower.
Welding materials and time can be saved. (4) Since the amount of welding is small, welding distortion is reduced accordingly.
Component accuracy improves. (5) The number of man-hours and personnel for forming and tack welding the backing material can be reduced. (6) If there is a backing material, after the main welded joint is formed as described above, the gap between the column, diaphragm, and backing material will be in a state where cracks have occurred in the joint (

(see FIG. 6), which is not preferred in terms of strength. According to this embodiment, such a problem does not occur. Of course, the above-mentioned effect is the same as the effect in longitudinal direction both-edge butt joint welding when manufacturing a one-seam large-diameter steel pipe by bending a strip steel plate along the longitudinal axis direction.

FIG. 1 is a schematic block diagram of a joining welding control device for measuring plate thickness, which is installed on a tool stand to carry out the method of the present invention. In the figure, 8 is a column that uses ultrasonic waves, etc. This is a device that measures the thickness of the peripheral wall steel plate a, and the signal output from the device that displays the plate thickness a is generated by a heat input control block 9 in which the value of the known beveling depth b is set in advance. Here, perform the calculation a-b=t,
Calculate and determine the Δp signal to be corrected according to the variation of the root face dimension t in 0.5 mm increments, and calculate the optimal joint weld P+Δp.
The thyristor control unit 10 is controlled based on the signal to control the welding conditions of the joining welding device 11. Note that P is a joining welding control signal.

Since the optimal joining welding conditions are related to the control of the laser beam output of the joining welding device and the welding speed of the workpiece, it is also possible to control the speed of the dice-shaped column feeding mechanism described later. It is mentioned as one of the. FIG. 3 is a plan view of an example of a processing machine for assisting the implementation of the construction method of the present invention, a part of which is a schematic view of the main part shown with phantom lines. In the figure, 1 is a dice-shaped column formed by cutting a rectangular steel pipe short and at right angles in the longitudinal axis direction, with both open ends facing upward and downward, and the column end face The bevel 2 and root face 3 as shown in FIG. 2 have already been formed. Further, a diaphragm 5 is crimped to the upper end opening of the column 1 while maintaining the mutual positions shown in FIG. In order to fix the diaphragm 5, for example, a hole may be made in the center of the diaphragm 5, and the diaphragm 5 may be bolted to the vertical feed table 12 through the hole.

Reference numeral 12 denotes a vertical feed table which is supported so as to be reciprocally driven in the y-axis direction.The table 12 is provided with a protrusion having a nut 14 for screwing the vertical feed screw 13.
By selecting the rotation direction of y
It can be slid back and forth along the axial guide surface. As described above, the feed speed of the vertical feed table 12 may be controlled based on the magnitude of the joining welding signal P+Δp. In this embodiment, the vertical feed table 12 is driven by the vertical feed screw 13, but it goes without saying that this mechanism can be replaced by a known double-acting hydraulic mechanism.

Reference numeral 15 denotes guide grooves cut into the vertical feed table 12. The grooves are arranged so as to intersect in a cross pattern on the surface of the table 12, and the column mounting pawls 16 slide into each groove 15 one by one.・It is fitted so that it can be fixed. Each of the opposing surfaces of the mounting claws 16 is provided with a cylindrical surface having a radius slightly larger than the radius of the cross-sectional corner R of the column 1, and an uneven groove parallel to the generatrix direction of the cylindrical surface. The mounting claws 15 press each corner of the dice-shaped column 1 placed on the vertical feed table 12 to fix the member on the vertical feed table.
At that time, the column 1 needs to be fixed so that each side surface constituting the member is parallel to the x-axis and the y-axis, respectively. Reference numeral 17 denotes a cross-feed table supported so as to be reciprocating in the x-axis direction. The cross-feed table 17 is provided with a protrusion equipped with a nut for screwing the cross-feed screw 18, and the rotation direction of the feed screw 18 is By selecting , the operation of the horizontal feed table 17 can be controlled in the same manner as in the case of the vertical feed table 12 described above.

Reference numeral 19 denotes a central shaft on the traversing table 17, which stands in the direction perpendicular (z-axis) to the sliding plane thereof.
On the same axis 19 is an index disk 20 that rotates around this axis.
A spur gear or a worm gear is continuously formed on the outer periphery of the index disk 20, and an output shaft gear from a power device installed on the transverse feed table 17 is meshed with the spur gear or worm gear. , the disc 20 is indexed and rotated 90° to the interstices. Reference numeral 21 denotes a sliding groove provided on the index disk 20 in the radial direction with respect to the center axis 19, and the base of the tool stand 22 is slidably attached to the groove 21 in the direction of the center axis 19. They are pressed together and mated together.

A guide roller 24 is attached to the tool stand 22 on the side in the direction of the center axis 19 and is supported by a support shaft 23 mounted parallel to the center axis. The tool stand 22 is brought into contact with the circumferential surface of the dice-shaped column 1 fixed to the column 1 by a spring bias, and the position of the tool stand 22 within the sliding groove 21 is regulated by the column circumferential surface. In addition, as mentioned earlier, the tool stand 22 is equipped with the laser beam irradiation end of the joining welding device that irradiates parallel to the sliding direction and the non-contact plate thickness measuring device, and the plate thickness measuring device 8 measures the thickness of the plate. With the end facing the column circumferential surface, the laser beam direction is directed toward the groove side of the butt contact portion between the diaphragm 5 and the end root face of the column 1, and irradiates the diaphragm 5 surface at an angle of approximately 15°. Set it as follows.

Next, the indexing disk 20 is rotated and the sliding direction of the tool stand 22 on the disk is adjusted to be perpendicular to the side plane of the column 1, and then the tip side guide roller 2 is adjusted to be perpendicular to the side plane of the column 1.
4 to the tool stand 22 in the direction in which it abuts the outer peripheral surface of the column 1.
The guide rollers are brought into contact with the outer wall surface of the column by sliding the guide rollers 24 and the tool stand 22 under the bias of the springs.
is brought into contact with the outer peripheral surface of the dice-shaped column 1. At this time, the measurement target area of the plate thickness measuring instrument 8 on the tool stand 22 and the laser beam irradiation point of the joining welding device 11 are respectively directed to the column end face root face 3 and the diaphragm to be welded in the front direction of movement of the tool stand 22. 5 and the contact portion.

[0027] Thus, the dimensions of the root face 3 of the joint welding location are calculated based on the output signal from the plate thickness measuring device 8, and the power to the joint welding device 11 is adjusted by controlling the thyristor 10 based on the calculated size. The laser beam output is adjusted according to the dimensions of the welded joint, and welding is performed to the extent that a back wave is generated at the welded joint. So, leave it in this state x
By sending the cross feed table 17 in the axial direction, the joining welding device 11 is guided by the outer wall surface of the column 1 and moves relatively along the outer periphery of the steel pipe column, so that the joining welding device 11 is guided by the outer wall surface of the column 1 and moves relatively along the outer periphery of the steel pipe column. On the other hand, regardless of the thickness of the steel plate root face or the flatness of the sides,
It is possible to continuously form bonded welded joints that create back waves.

When the position of the guide roller 24 or the tool stand 22 in the lateral feed direction reaches the starting point or the center point of the corner R forming the opening edge of the column 1 to be processed, the feed is stopped. stop, and at that position gradually rotate the index disc 9
It is rotated by 0° and the tool stand 22, that is, the joining and welding device is swung along the outer shape of the corner R of the column end face. At that time, the guide roller moves along the outer wall of the corner R of the column end face and guides the position of the tool stand 22, so the direction of laser beam irradiation from the plate thickness measuring means and the joining welding device to the relevant point is controlled by the column. It is perpendicular to the circumferential surface and is similar to that on the first side. In other words, in the case of this invention method, when welding joints, the plate thickness a of the column peripheral wall is measured in advance, and the root face dimension is calculated by subtracting the known groove depth b from that dimension. Since the laser output or the welding speed is controlled so as to obtain an appropriate irradiation dose, it is possible to realize a welded joint with a good welded joint in which back waves occur continuously at all times.

After the indexing disc has been completely rotated by 90° and the laser beam of the joining and welding device is placed on the second side that constitutes the column end face, the vertical feed table 1 with the dice-shaped column fixed thereon is moved.
2 is sent out in the longitudinal direction y, and the joining welding device is moved along the second side of the column end face in a relative relationship. Of course, at this time as well, the guide roller 24 is brought into contact with and guided by the outer peripheral surface of the column, thereby guiding the position of the welding device relative to the steel plate forming the column. The above vertical feeding operation stops when the vertical feeding direction of the laser beam irradiation of the joining welding device is sent to the starting point of the corner R forming the peripheral wall of the column to be processed or the center point of the corner R Then, at the stopped position, the indexing disk 20 is gradually rotated and indexed by 90 degrees, and the joining welding device 1 on the tool stand 22 is rotated.
1 along the outer shape of the corner R, and its functions and effects are as described above. Thus, the joining and welding device 11 faces above the third side forming the column end face.

By fixing the phase of the index disk 20 as it is and then moving the traversing table 17 to the old position, that is, by traversing it in the backward movement direction, the joining welding device 11 is moved to the third position forming the column end face. , and apply the desired welded joint to that part. Hereinafter, the process proceeds based on substantially the same steps as those described in (2) to (4) above, and a desired continuous welded joint can be formed between the dice-shaped column opening end and the diaphragm. After joining and welding a diaphragm to one side of the opening edge of the dice-shaped column, remove the dice-shaped column from the mounting claw, turn it over, and place another diaphragm again on the beveled side of the column opening edge, By repeating the operation from the step (1) described above, the diaphragm can be joined and welded to both opening edges of the column to form a column beam joint material.

(Part 2) In FIG. 1, the root face dimension is directly measured by a non-contact steel plate thickness measuring device 8 using ultrasonic waves, etc., and a signal representing the plate thickness is inputted to the heat input control block 9. Then, set the root face dimension to 0.
．． A correction signal Δp is calculated in accordance with the variation every 5 mm, and a P+Δp signal is input to the thyristor control unit 10 so as to supply the laser beam generator with a current capable of generating an output with optimal bonding conditions. Note that P is a joining welding control signal. Since the optimal joining welding conditions are related to the control of the laser beam output and the welding speed of the workpiece, an example of this embodiment is to control the speed of the dice-shaped column feeding mechanism. The other steps are basically the same as those described in Example (Part 1), including operations and effects.

[0032]

[Effects of the Invention] As described above, according to the method of the present invention, when butt welding beveled end faces or end faces and a diaphragm, a backing metal (material) is attached to the relevant part. By directly irradiating the laser beam to the location without mounting, it is now possible to achieve good joint welding, which streamlines the joint welding between the column and the diaphragm, resulting in the above-mentioned

[Prior art] or

In addition to solving the various problems described in the [Function] section, it also makes it possible to automate the assembly of pillar beams and joint materials, or the forming of steel pipes, and to enable economical production. It produces extraordinary effects and effects that could not be expected.

[Brief explanation of drawings]

[Figure 1] Block diagram of joining welding equipment

[Figure 2] Enlarged cross-section of main parts of column beam joint material formed by the method of the present invention

[Fig. 3] Plane showing part of the auxiliary processing machine for implementing the construction method of the present invention with imaginary lines

[Figure 4] Enlarged cross section of main parts of pillar beam joint material formed using conventional construction method

[Figure 5] Side cross section of column beam joint material formed using conventional construction method

[Figure 6] Enlarged cross section of main parts of pillar beam joint material formed using conventional construction method

[Explanation of symbols]

1 Dice-shaped column 2 Bevel part 3 Root face 4　Join welding joint 5 Diaphragm 6　Actual welded joint 7 Backing gold (material) 8 Plate thickness measuring device 9 Heat input controller 10 Thyristor control unit 11　Joining welding equipment 12 Vertical feed base 13 Vertical feed screw 14 Nut 15 Groove 16 Column mounting claw 17 Transverse feed table 18 Lateral feed screw 19 Central axis 20 Index disk 21 Groove 22 Tool stand 23 Support shaft 24 Guide roller

Claims (2)

[Claims] [Claim 1] A root face formed by beveling a side edge of a steel plate is brought into butt contact with a diaphragm surface, or
After the root faces of the steel plate grooves are butt-contacted, a laser beam is directly irradiated along the abutment or butt-contact area, and welding is performed to the extent that a back wave is formed locally. In a joining welding method that uses a laser beam to connect parts, the thickness of the plate near the laser beam irradiation area is measured using a non-contact plate thickness measuring means such as ultrasonic waves, and the thickness of the groove is determined based on the measured value. Steel plate mutual or plate thickness measurement characterized by joining and welding while selecting and controlling the welding speed, output, etc. of a laser beam that can form the joining joint according to the length of the root face dimension obtained by subtracting the dimensions. Controlled joining welding method. [Claim 2] The root face formed by beveling the side edge of the steel plate is brought into butt contact with the diaphragm surface, or
After the root faces of the steel plate grooves are butt-contacted, a laser beam is directly irradiated along the abutment or butt-contact area, and welding is performed to the extent that a back wave is formed locally. In a joining welding method that uses a laser beam to connect parts, the thickness of the root face that hits the laser beam irradiation area is directly measured using a non-contact plate thickness measuring means such as ultrasonic waves, and the measured value is A joining welding control method by measuring the mutual or plate thickness of steel plates, characterized in that joining welding is performed while selecting and controlling the welding speed, output, etc. of a laser beam that can form the joining joint.