Welding process of aluminum alloy car body chassis for subway

Abstract

The invention discloses a welding technology for an aluminum alloy vehicle chassis for a subway. The welding technology mainly comprises the following steps of chassis forward assembly, chassis reverse assembly, accessory welding and detection. According to the welding technology, all the tack fixing processes are conducted on forwards assembled tools, a base plate and a boundary beam are welded in the mode that welding is conducted from the middle to the two sides, and sequence welding is adopted in the welding process of a sleeper beam and a floor; in addition, the welding deformation is controlled by additionally arranging a transverse supporting device; the welding technology has the remarkable advantages that the deformation amount and the alignment tolerance are controlled, the welding performance is improved, the size deviation is reduced, the percent of pass of products is improved, and energy consumption is reduced.

Description

technical field [0001] The invention belongs to the field of aluminum alloy welding, and in particular relates to a welding process for an aluminum alloy car body chassis for a subway. Background technique [0002] The welding of aluminum alloy car body chassis is mainly to connect and fix the floor, traction, corbel, side beam and end beam formed after welding and machining into one. The welding process in the prior art mainly has the following problems: [0003] 1. During the welding process of the floor and side beams, the diagonal welding method is adopted. Due to the long weld seam, there is a large post-weld residual stress, resulting in welding deformation; [0004] 2. During the welding process of the corbel beam and the floor, the welding direction is from the arc-starting end to the arc-ending end. Because there is no horizontal support, it will cause deformation after welding and it is difficult to repair; [0005] 3. The floor and all parts are spot-fixed, resu...

AI Technical Summary

Problems solved by technology

[0003] 1. During the welding process of the floor and side beams, the diagonal welding method is adopted. Due to the long weld seam, there is a large post-weld residual stress, resulting in welding deformation;

[0004] 2. During the welding process of the corbel beam and the floor, the welding direction is from the arc-starting end to the arc-ending end. Because there is no horizontal support, it will cause deformation after welding and it is difficult to repair;

[0005] 3. Points are fixed between the floor and each part, resulting in too large gaps between some welds and poor precision

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