采用Ni中间层的5052铝合金/DP600车用钢电阻点焊研究

李佳; 陈地群; 冉启洪; 岳林; 汪维登; 钟海平

doi:10.7512/j.issn.1001-2303.2020.12.03

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采用Ni中间层的5052铝合金/DP600车用钢电阻点焊研究
Resistance spot welding study of 5052 Al alloy and DP600 automobile steel using Ni interlayer
2020年50卷第12期页码：9-13
纸质出版：2020
DOI： 10.7512/j.issn.1001-2303.2020.12.03
稿件说明：

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李佳, 陈地群, 冉启洪, 等. 采用Ni中间层的5052铝合金/DP600车用钢电阻点焊研究[J]. 电焊机, 2020,50(12):9-13. DOI： 10.7512/j.issn.1001-2303.2020.12.03.

LI Jia, CHEN Diqun, RAN Qihong, et al. Resistance spot welding study of 5052 Al alloy and DP600 automobile steel using Ni interlayer[J]. Eletric Welding Machine2020, 50(12): 9-13. DOI： 10.7512/j.issn.1001-2303.2020.12.03.

摘要

采用Ni做中间层实现了5052铝合金和DP600车用钢的电阻点焊连接

借助扫描电镜和拉伸-剪切实验对接头界面组织和连接强度进行了表征和评价。结果表明

在点焊过程中

Ni中间层未发生熔化

完全阻隔了铝合金和钢母材之间的冶金反应。在铝合金/中间层界面

生成了Al3Ni金属间化合物层

冶金结合良好。在Ni中间层/钢界面

主要通过固态扩散形成Fe-Ni固溶体实现连接

但存在大量的未焊合区。随着焊接电流增大

未焊合区面积逐渐减少。接头连接强度随焊接电流增大而显著提升

在焊接电流11 kA时接头最大载荷达到4.3 kN。

Abstract

Resistance spot welding of 5052 Al alloy and DP600 automotive steel is realized by using a Ni interlayer.The interfacial microstructure and mechanical properties ofjoints are investigated by SEM and tensile-shear test.The results show that the Ni interlayer remains integral during the welding process and completely suppresses the interaction between Al alloy and steel base metal.Robust metallurgical bonding is achieved at the Al/Ni interlayer interface by forming Al

Ni intermetallic phase.Joining at the Ni interlayer/steel interface is realized by formation of Fe-Ni solid solution via solid state diffusion bonding.However

considerable amount of unbondedzoneexists.The bonding area improves by elevating the welding current.Bonding strength appreciably enhances as welding current increases.The maximum tensile-shear loading of 4.3 KN is obtained at welding current of 11 KA.