JP2000167664A - Strain suppression method of thin sheet welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a strain suppression method suitable for preventing or suppressing occurrence of a welding strain in a welding joint subjected to sheet butt welding in a strain suppression method of thin sheet welding. SOLUTION: This sheet welding base materials 1A, 1B to be subjected to butt welding are held by a receiving side restricting jig 2 and a press side restricting jig 3, restricting force is applied to the welding joint part of restricting jigs 2 and 3 by fastening bolts 8. In this state, by conducting butt welding of the base materials 1A, 1B from a slit part 6 of the press side restricting jig 3, generation of the welding strain can be prevented or suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suppressing distortion in thin plate welding, and more particularly to a method for suppressing distortion in a weld joint for butt welding thin plates, which is suitable for preventing or suppressing the occurrence of welding distortion.

[0002]

2. Description of the Related Art Conventionally, when butt welding thin plates,
In the flat plate butt joint shown in FIG. 10 and the longitudinal butt joint of the body plate shown in FIG. 12, welding distortion 9 such as undulation or bending is generated in the vicinity of the weld joint portion 4 due to the heat effect of welding.
For this reason, the welding distortion 9 is generally corrected by pressing, hammering, point heat quenching, or the like.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for suppressing distortion in butt welding of thin plates and reducing the work of correcting distortion in butt welding joints of thin plates.

[0004]

According to the distortion suppressing method of the present invention, a butt-welded portion of a thin plate is pressed by upper and lower restraining jigs, and a restraining force is applied to the welded portion of the base material of the thin plate. By performing butt welding while maintaining the above, welding distortion generated at the time of welding is prevented and suppressed.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 to 9, FIG. 11, and FIG. FIG. 1 is a perspective view showing a flat plate butt joint. Reference numerals 1A and 1B denote a thin plate welding base material for performing butt welding, one end of which has a groove for forming a butt weld joint 4, and butt the groove. To form a butt weld joint 4. 2 to 5 show the structure of a restraining jig for suppressing welding distortion. In FIG. 2, a holding-side restraining jig 2 is a restraining jig for holding the butt welding joint 4 shown in FIG. 1 from the welding side. AA is provided at the center of the jig so that the butt joint can be easily welded. A slit 6 having a shape as shown in FIG. 3 is provided. At both ends of the jig, bolt holes 5 for mounting and tightening the jig are arranged.
In FIG. 4, a receiving-side restraining jig 3 is a restraining jig installed for supporting and restraining the butt weld joint 4 shown in FIG. 1 from the opposite side of the welding, so that a high surface pressure can be applied to the butt weld joint 4. A gradient 7 for providing a middle-high shape as shown in AA (FIG. 5) is provided. At both ends of the jig, bolt holes 5 for mounting and tightening the jig are arranged.

FIGS. 6 to 9 are structural views showing an embodiment and a structure of a flat plate butt joint according to the present invention. After the butt weld joint 4 shown in FIG. 1 is formed, the receiving side restraining jig 3 is arranged on the side opposite to the welding side, the holding side restraining jig 2 is arranged on the welding side with the slit section 6 aligned with the welding joint section 4, Side restraint jig 3
Then, the flat plate butt welding joint 4 is sandwiched by the holding-side restraining jig 2, and the restraining jigs 2, 3 are tightened by the tightening bolt 8 to apply a restraining force to the butt welding joint 4. Next, while the restraining force is applied to the base material welding joint 4, the holding-side restraining jig 2 is
The butt weld joint 4 is welded from the slit portion 6 of FIG. Since a strong restraining force is applied to the periphery of the butt weld joint portion 4, even if the welding distortion 9 is generated due to the influence of heat at the time of welding, the generation is suppressed. The release of the tightening by the restraining jigs 2 and 3 is performed after the temperature of the joint portion 4 is reduced to a level that does not cause thermal deformation after the welding is completed.

In the case of a flat plate butt weld joint as shown in FIG. 10, the restraining jigs 2 and 3 are used as shown in FIG. 11, and in the case of a body plate butt weld joint as shown in FIG. The restraining jigs 2 and 3 are used as shown in FIG.

[0008]

As described above, according to the present invention,
In the butt welding of thin plates, the occurrence of welding distortion at the welded portion can be prevented or suppressed, so that the work of correcting distortion after welding is unnecessary or can be remarkably reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a flat plate butt joint.

FIG. 2 is a perspective view showing an example of a holding-side welding jig used in the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view showing an example of a receiving-side welding jig used in the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a configuration diagram showing one embodiment of a method for suppressing distortion in thin plate welding according to the present invention.

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is a side view of FIG. 6;

FIG. 9 is a sectional view taken along the line CC in FIG. 6;

FIG. 10 is a perspective view showing a state of occurrence of welding distortion in a flat plate butt-welded joint.

FIG. 11 is a perspective view showing another embodiment of the present invention.

FIG. 12 is a perspective view showing a state of occurrence of welding distortion at a butt weld joint of the body plate.

FIG. 13 is a perspective view showing another embodiment of the present invention.

[Explanation of Signs] 1A, 1B: thin plate welding base material, 2: receiving side restraining jig, 3 ...
Pressing-side restraining jig, 4 ... butt welding joint, 5 ... tightening bolt hole, 6 ... slit (for welding), 7 ... gradient, 8 ... restraining jig tightening bolt, 9 ... welding distortion.

Claims (3)

[Claims] 1. A weld joint for butt welding thin plates,
A method for suppressing the distortion of thin plate welding, wherein the occurrence of welding distortion is suppressed by a jig for restraining a welded portion. 2. The jig comprises a holding-side restraining jig having an opening in the center, and a receiving-side restraining jig for receiving and supporting a welded joint, and exposing the welded joint from the opening. A method for suppressing distortion in thin plate welding, wherein the welding joint is butt-welded in a state where the joint is restrained by the holding-side restraining jig and the receiving-side restraining jig. A holding-side restraining jig having an opening in the center;
A welding jig comprising: a receiving-side restraining jig for receiving and supporting a welded joint portion; and a restraining means for exposing the welded joint portion from the opening and restraining the welded joint portion with the holding-side restraining jig and the receiving-side restraining jig. .