Numerical analysis of stress distribution of stainless steel sheet laser overlap welding joints

WANG Hongxiao; WANG Chunsheng; HE Guangzhong; GAO Wenwen

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Numerical analysis of stress distribution of stainless steel sheet laser overlap welding joints
Vol. 48, Issue 3, Pages: 375-379(2018)
Published：2018
DOI：
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DOI：

WANG Hongxiao, WANG Chunsheng, HE Guangzhong, et al. Numerical analysis of stress distribution of stainless steel sheet laser overlap welding joints[J]. Eletric Welding Machine2018, 48(3): 375-379. DOI：

摘要

不锈钢车体侧墙与骨架之间采用激光叠焊取代传统的电阻点焊具有更好的强度优势

且两种焊接方法在疲劳实验中的断裂形式不同。从力学角度来说这可能与两种接头的应力分布状态和应力集中程度不同有关

而应力集中是引起焊接接头疲劳破坏的主要因素。基于ABAQUS有限元分析软件

对这两种接头在不同外加载荷作用下的应力分布进行数值分析

计算应力集中系数

并预测接头疲劳裂纹的起裂位置和扩展趋势。结果表明:电阻点焊接头在车体侧墙一侧的应力集中系数高出激光叠焊接头的4.42倍

在骨架一侧高出激光叠焊接头的2.76倍

疲劳实验裂纹萌生位置在最大应力集中处

与模拟结果一致。

Abstract

The strength of laser overlap laser welding joint of the column and the side wall of stainless steel railway vehicle body is higher than that of resistant spot welding joint

the frature forms of the two welding methods are different in the fatigue test. From a mechanical point of view

this may be related to the different stress distribution and the stress concentration of the two joints. And the stress concentration is the main factor causing the fatigue damage of welded joints. Therefore

based on the ABAQUS finite element analysis software

the stress distribution of the two kinds of joints under different applied loads is numerically analyzed

the stress concentration factor is calculated

and the initiation and propagation of fatigue cracks are predicted. The results show that the stress concentration factor of resistance spot welded joint is 4.42 times higher than that of laser welded joints

and 2.76 times higher than that of laser welded joints on one side of the column. The fatigue crack initiation position is at the maximum stress concentration

consistent with the simulation results.