Method for welding railway vehicle side wallboard

Abstract

The invention discloses a method for welding side wall plates of a train lorry, including the steps: (a) the side wall plates are stretched along the direction of the welding edges of the side wall plates so as to cause the side wall plates to be elastically deformed; and (b) a plurality of elastically deformed side wall plates in the step (a) are respectively paired to be welded, and the drawing force causing the side wall plates to be elastically deformed is maintained during welding. The method has the technical scheme that before the side wall palates are welded, certain. stretching stress is applied to both ends of each side wall plate along the direction of one welding edge so as to elastically deform each side wall plate to a certain degree. When the side wall plates are elastically deformed, pull stress is generated in each side wall plate; in the process of welding, crystal grains are heated to be expanded and are mutually extruded; and the existence of the pull stress counteracts the thermal expansion pressure stress among the crystal grains, thus the plastic deformation of the crystal grains can be eliminated or lessened, thereby preventing a welding seam from being retracted, and effectively reducing the planeness of the side wall plate.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method for a side wall panel of a railway vehicle. Background technique [0002] The railway freight car open car is mainly responsible for the transportation of bulk goods on the railway, such as coal, logs, coke or ore. The railway gondola car body is mainly composed of side walls, end walls and underframes. The main structure of the side walls is a plate-column structure, which is welded by a steel plate with a thickness of about 5mm and a side column of a channel structure. [0003] In the welding process of the side wall, the side column and the side wall steel plate are welded into one body, and then assembled with the end wall and the bottom frame to form a gondola structure. Under the existing technology, the welding of the side wall is to assemble and weld multiple side wall panels in a free state or a compressed state, that is, firstly lay the side wall panels on the side ...

AI Technical Summary

Problems solved by technology

In the process of welding, after the crystal grains are thermally expanded and plastically deformed, no matter how the welding sequence is changed, the shrinkage of the weld seam caused by the plastic deformation of the grains cannot be prevented, and the concave-convex deformation of the side wall panel cannot be solved in the end.

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