Laser lapping half penetration weld method

Abstract

The invention discloses a laser lapping half penetration weld method, which is characterized in that a protection film covers a non-penetration surface to obstruct air for welding. Because the protection film covers the non-penetration surface to obstruct air for welding, the exposed non-penetration surface of a stainless steel trolley coach steel structure is reduced and prevented from being oxidized and discolored; the original color of the outer surface of the stainless steel trolley coach steel structure can be kept attractive; the operation of electrochemical corrosion to remove oxidative stain for the exposed non-penetration surface after welding is canceled and reduced; the outer surface of the stainless steel trolley coach steel structure is protected from color difference; working procedures are reduced, the time is saved, the production efficiency is improved, and the product cost is lowered; the chemical preparation discharge and the environment pollution are reduced; and the pollution treatment cost is saved.

Description

technical field [0001] The invention relates to a laser lap joint semi-penetration welding method, in particular to a laser lap joint semi-penetration welding process without oxidation protection on the non-penetration surface. Background technique [0002] Promote the application of laser lap semi-penetration welding technology in the manufacture of stainless steel rail passenger car steel structure. The non-penetration surface will be oxidized and discolored when heated, which will affect the appearance of the exposed surface of the steel structure. Electrochemical corrosion is often used to remove oxidative discoloration on the exposed unpenetrated surface after welding, but it brings problems such as complex process, high cost, chemical agent pollution, and inconsistent color of the outer surface of the steel structure. Contents of the invention [0003] The purpose of the present invention is to provide a new welding method to avoid and reduce the oxidation and disco...

AI Technical Summary

Problems solved by technology

Electrochemical corrosion is often used to remove oxidative discoloration on the exposed unpenetrated surface after welding, but it brings