Laser lap welding and resistance spot welding process analysis on railway passenger cars

LIU Qingzhu; WANG Hongxiao; ZHAO Guoxin

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Laser lap welding and resistance spot welding process analysis on railway passenger cars
Vol. 48, Issue 10, Pages: 44-47(2018)
Published：2018
DOI：
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DOI：

LIU Qingzhu, WANG Hongxiao, ZHAO Guoxin. Laser lap welding and resistance spot welding process analysis on railway passenger cars[J]. Eletric Welding Machine2018, 48(10): 44-47. DOI：

摘要

不锈钢车体轨道车辆制造多采用电阻点焊工艺

缺点是焊点处存在明显的压痕

影响不涂装车体外观质量。同时点焊工艺制造的车体气密差

很难实现不锈钢车辆的高速运行。为此研发部分熔透的激光搭接焊工艺

改善车体的表面质量及气密性

同时对接头强度、外观质量、微观结构及工作效率等方面进行激光搭接与电阻点焊工艺的比较

结果表明

激光搭接焊工艺可替代电阻点焊工艺焊接不锈钢车体

实现既满足连接强度又提高车体外观化水平的目的

提高不锈钢车辆的生产水平。

Abstract

Currently

stainless steel railway vehicles body and structure are usually assembled by resistance spot welding process. The weak points of this process are the poor surface quality and bad airtight due to the pressure of electrodes. The partial penetration lap laser welding is investigated as a solution for the disadvantages of resistant spot welding stainless steel railway vehicles. In this paper the joint strength

appearance quality

microscopic structure and the working efficiency of a laser welding and resistance spot welding process are compared

and the results show that laser welding process can replace the resistance spot welding process to manufacture stainless steel car body

and can satisfy the demands of both the connection strength and the level of car body appearance. The application of lap laser welding process improves the production efficiency of stainless steel vehicle.