Welding method of stainless steel sheet

Abstract

The invention relates to a welding method of a stainless steel sheet. A welding gun is controlled to adopt a straight line reciprocating type welding operation track, the welding quality of an electric arc is ensured through improving the moving process of the welding operation on the premise of determining a welding parameter, and then the purpose for reducing welding deformation is achieved. The welding gun is controlled to adopt the straight line reciprocating type welding operation along the angular butt welding seam of the stainless steel sheet in the method. A plurality of contiguous reciprocating motion periods are comprised in the whole straight line reciprocating type welding operation process, and the same welding speed is adopted in each motion period. The welding mode of firstly welding a long distance forwards and then repeatedly welding a short distance backwards is adopted in each motion period. The electric arch is difficult to drift and easy to fuse at a welding point through the straight line reciprocating type welding operation, the welding seam has small weld reinforcement, the welding speed can be accordingly enhanced so that the phenomenon of overburning the tissues of the welding seam is avoided, and the welding quality of the electric arc is obviously enhanced.

Description

technical field [0001] The invention relates to a welding method for angle butt welds of stainless steel thin plates, which belongs to the field of mechanical manufacturing. Background technique [0002] Currently used in high-speed rail vehicles, such as EMUs with a speed of more than 200 kilometers per hour, the car body structure is basically made of stainless steel plates. Because the car body uses a large number of stainless steel sheets, the overall weight is relatively small, but it is followed by welding problems at the corner joints of the steel plates. [0003] Welding at fillet joints of thin plates is prone to large deformations, making it difficult to control the quality of such workpieces. Usually, it is necessary to carry out additional adjustment and shaping after welding to ensure that the external dimensions of the car body frame meet the requirements of use. [0004] as attached figure 1 The straight line welding method shown, and the attached figure ...

AI Technical Summary

Problems solved by technology

[0005] During the welding process, the arc is prone to drift, and it is difficult to form the fusion of solder joints; because the weld reinforcement is too large, it is easy to form undercut phenomenon; the welding speed is difficult to increase, and the weld tissue is over-burned, which affects the mechanical stiffness, etc.

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