Method for welding non-coating stainless steel plate in laser mode

Abstract

The invention relates to a method for welding a non-coating stainless steel plate in a laser mode. An upper layer panel and a lower layer panel are stacked up, a layer of protecting film is arranged on the exposed surface of the lower layer panel, and the upper layer panel and the lower layer panel are connected by enabling a laser welding light beam to penetrate through the protecting film to reach a certain depth of the lower layer panel. On the premise that the assembling precision meets the laser welding requirements, the welding technology methods are selected in the aspects of controlling the appearance quality and guaranteeing the connector connecting strength according to the product requirements for a railway vehicle non-coating stainless steel vehicle body and the technology characteristics, and a certain welding width and a certain welding depth are controlled by controlling the welding technology parameters such as welding power and welding speed. The welding joint cannot be oxidized and the welding heat can be more centralized by adopting the special technologies of welding the exposed wall plate provided with the protecting film and placing an aluminum alloy base plate on the lower surface of a workpiece, the strength of the welding joint is guaranteed, the back face of the exposed welding joint cannot deform obviously, and the color of the back face of the exposed welding joint cannot change obviously.

Description

technical field [0001] The invention relates to a laser welding method for a stainless steel plate, in particular to a laser welding method for a stainless steel plate which requires the commercialization of an exposed surface. Background technique [0002] In rail vehicles such as subways, light rails, and EMUs, stainless steel car bodies have been gradually promoted and applied. Stainless steel materials have high strength and corrosion resistance, and are light in weight, low in maintenance costs, beautiful in appearance, and do not need to be painted on the outer surface. Features such as outfitting. In the prior art, a laser welding process is used for the welding between the stainless steel wallboard and the wallboard reinforcing member. Such as figure 1 As shown, it is a schematic diagram of the traditional welding method. Although the traditional laser welding process can ensure the connection strength of the joint and the welding speed is fast, after welding, the ...

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Problems solved by technology

like figure 1 As shown, it is a schematic diagram of the traditional welding method. Although the traditional laser welding process can ensure the connection strength of the joint and the welding speed is fast, after welding, the outer surface of the wall panel will be deformed greatly, and at the same time, it will be damaged due to high temperature. The phenomenon of oxidation color appears. For the stainless steel car body with no coating process on the outer surface, its exposed surface has high requirements for commercialization. The deformation and discoloration caused by welding will directly affect its appearance

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