中国激光, 2019, 46 (8): 0802002, 网络出版: 2019-08-13   

基于Ni中间层的铝合金与高强钢激光诱导TIG复合焊接 下载: 1056次

Aluminum Alloy and High-Strength Steel Joint via Laser-Induced Tungsten Inert Gas Hybrid Welding Based on Ni Interlayer
作者单位
大连理工大学材料科学与工程学院辽宁省先进连接技术重点实验室, 辽宁 大连 116024
摘要
提出了加入Ni中间层的6061铝合金与DP980高强钢搭接接头激光诱导电弧复合连接技术,采用该技术实现了6061铝合金与DP980高强钢的良好连接。分析了Ni中间层对搭接接头力学性能、微观组织的影响,并分析了Ni中间层在焊接过程中的作用。使用光学显微镜、扫描电镜、电子探针、X射线衍射仪等对典型焊接接头的显微组织、元素分布进行分析。结果表明:在铝合金与高强钢之间加入Ni中间层,能有效阻止Fe元素向铝合金基体中扩散,并改变了6061/DP980界面金属间化合物的种类及分布,金属间化合物的厚度明显减小,金属间化合物主要由FeAl3和Fe2Al5组成,Ni元素也发生扩散,并主要以Al-Ni化合物及Fe(Ni)固溶体的形式存在于焊缝中。添加Ni中间层焊接接头的剪切拉伸载荷可达到173 N/mm,比未添加Ni中间层的接头提高了约35%。
Abstract
This study proposes laser-induced arc hybrid welding technology for 6061 aluminum (Al) alloy/DP980 high-strength steel lap jointing with a nickel (Ni) interlayer, which achieves a good connection between 6061 Al alloy and DP980 high-strength steel. The effect of Ni interlayer on the mechanical properties and microstructure of the lap joints and the effect of the Ni interlayer in the welding process are analyzed. An optical microscope, a scanning electron microscope, an electron probe, and an X-ray diffractometer are used to analyze the microstructure and elemental distributions of typical lap joints. Experimental results show that adding a Ni interlayer between Al alloy and high-strength steel can effectively prevent the diffusion of Fe element into aluminum alloy matrix and change the types and distributions of intermetallic compounds (IMCs) at the 6061/DP980 interface. With the Ni interlayer, the IMC-layer thickness reduces obviously, and the IMC layer primarily contains FeAl3 and Fe2Al5. Simultaneously, the Ni element is mainly diffused in the form of an Al-Ni compound and an Fe (Ni) solid solution in the weld. The shear tensile load of the joint with the Ni interlayer can reach a maximum of 173 N/mm, indicating an increase of ~35% compared to that of the joint without the Ni interlayer.

马雨晴, 王红阳, 刘黎明. 基于Ni中间层的铝合金与高强钢激光诱导TIG复合焊接[J]. 中国激光, 2019, 46(8): 0802002. Yuqing Ma, Hongyang Wang, Liming Liu. Aluminum Alloy and High-Strength Steel Joint via Laser-Induced Tungsten Inert Gas Hybrid Welding Based on Ni Interlayer[J]. Chinese Journal of Lasers, 2019, 46(8): 0802002.

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