Group welding method for five plates on roof of CRH5 motor train unit

Abstract

A group welding method for five plates on the roof of a CRH5 motor train unit is characterized by comprising the following steps: step one, a forward-assembly reversible deformation supporting block is pre-placed at the position of a middle top plate of the roof, wherein the height of the forward-assembly reversible deformation supporting block is 5 to 7mm; step two, the welding sequence is that first performing backward-assembly group welding and then performing forward-assembly group welding; when performing the backward-assembly group welding, two welding lines in the middle are welded first, and then two welding lines at two sides are welded; when performing the forward-assembly group welding, the two welding lines at the two sides are welded first and then the two welding lines in the middle are welded. According to the group welding method provided by the invention, the whole assembly and the whole welding of the five plates on the roof are realized, so that all butt welding lines are welded in the same working procedure, and the size is qualified and adjusting and repairing is avoided. The separation of the butt welding lines and lap welding lines of roof compounding is realized, the group welding time of subsequent whole roof compounding is reduced to 360 minutes from 960 minutes, the whole roof adjusting and repairing time is reduced to 45 minutes from 180 minutes, and the operation of staff is reduced to 2-riveting and 1-welding from 4-riveting and 2-welding, the assembly difficulties in the subsequent roof compounding, the labor intensity and the welding deformation are reduced, and the labor efficiency and product quality are improved.

Description

technical field [0001] The invention relates to a welding method for rail vehicle roof plates, in particular to a welding assembly method in which all butt welds are welded in the same process when five roof plates are welded. Background technique [0002] During the assembly and welding process of the roof profile of CRH5 EMU, the traditional French Alstom manufacturing process has been adopted at home and abroad. That is, the three profiles in the middle of the roof are assembled and welded first, and then combined with other profiles. This manufacturing method has the following disadvantages: the five profiles that make up all the butt welds of the roof (hereinafter referred to as the five panels of the roof) cannot The assembly welding is completed in the same process, resulting in the mixture of butt and lap welds in the subsequent assembly welding of the roof. The assembly is difficult, the welding heat input is large, the deformation after welding is serious, and the ...

AI Technical Summary

Problems solved by technology

That is, the three profiles in the middle of the roof are assembled and welded first, and then combined with other profiles. This manufacturing method has the following disadvantages: the five profiles that make up all the butt welds of the roof (hereinafter referred to as the five panels of the roof) cannot The assembly welding is completed in the same process, resulting in the mixture of butt and lap welds in the subsequent assembly welding of the roof. The assembly is difficult, the welding heat input is large, the deformation after welding is serious, and the width and shape of the roof are difficult to control. , affecting product quality

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