Research on SUS301L-DLT stainless steel of 6 mm resistance spot welding process

MEI Wenbo; XU Yanli; JIA Peng; QI Lu; YIN Xiaoliang

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Research on SUS301L-DLT stainless steel of 6 mm resistance spot welding process
Vol. 48, Issue 3, Pages: 371-374(2018)
Published：2018
DOI：
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DOI：

MEI Wenbo, XU Yanli, JIA Peng, et al. Research on SUS301L-DLT stainless steel of 6 mm resistance spot welding process[J]. Eletric Welding Machine2018, 48(3): 371-374. DOI：

摘要

在轨道车辆行业中

电阻点焊主要用于焊接板厚小于等于5 mm的不锈钢车体结构。而不锈钢车体结构中底架边梁和补强梁板厚均为6 mm

若能使用电阻点焊来减小焊接变形则具有重要的实际意义。对6 mm厚SUS301L-DLT不锈钢进行双面单点电阻点焊

通过外观检测、平滑度试验、断面试验和拉伸剪切试验

确定电阻点焊工艺。结果表明:在合理的电阻点焊参数条件下

6 mm厚SUS301L-DLT不锈钢电阻点焊焊点熔核直径可达到φ12.2 mm的要求

且拉伸剪切结果符合标准要求。增加电极压力可有效避免缩孔缺陷的出现

且电极压力不宜过大

否则易造成压痕过深、熔核直径过小等不足。

Abstract

In the rail vehicle industry

resistance spot welding is mainly used to weld stainless steel carbody structure whose thickness is less than 5 mm. However

in the stainless steel body structure

the thickness of the bottom frame side beam and the reinforcing beam plate are both 6 mm. It is of practical significance if resistance spot welding can be used to reduce the welding distortion. Double sided single point resistance spot welding for SUS301 L-DLT stainless steel of 6 mm is carried out. The resistance spot welding process is determined through appearance test

smoothness test

section test and tensile shear test. The results show that under the reasonable parameter conditions

the nugget diameter of SUS301 L-DLT stainless steel of 6 mm can reach to φ12.2 mm

and the results of tensile shear test meet standard requirements. The increasing of electrode pressure can effectively avoid the appearance of shrinkage defects.However

the electrode pressure should not be too large

otherwise it may easily cause indentation too deep and nugget diameter too short.