基于Ti中间层的AZ31B镁合金/6061铝合金电阻点焊研究  

Research on Resistance Spot Welding of AZ31B Magnesium Alloy/6061 Aluminum Alloy Based on Ti Interlayer

作　　者：胡浩 刘飞 侯庆磊 陈韬 Hu Hao;Liu Fei;Hou Qinglei;Chen Tao(Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学,安徽合肥230009

出　　处：《稀有金属材料与工程》2022年第6期2209-2214,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金青年基金(51704092)。

摘　　要：通过添加钛箔中间层,研究了镁/铝合金异种金属电阻搭接接头的微观组织与力学性能。结果表明,添加0.2mm厚度钛箔中间层可以大幅提高镁/铝异种金属电阻点焊(RSW)接头的结合强度,接头的最大拉剪力随焊接电流的增大先增大后减小;当焊接电流为14kA时,最大抗拉剪切力达到2.3kN。铝钛界面处有Al3Ti生成,接头断裂在镁侧热影响区上,经过换算接头的最大抗剪切强度能够达到156MPa。通过SEM和EDS分析,添加钛中间层阻断了镁合金和铝合金的相互扩散,钛中间层阻碍了Mg-Al金属间化合物的生成,从而大大提高接头的结合强度。The microstructure and mechanical properties of Mg/Al alloy dissimilar metal resistance lap joints were studied by adding an interlayer of titanium foil.The results show that adding a 0.2 mm thick titanium interlayer can greatly improve the strength of Mg/Al dissimilar metal resistance spot welding(RSW)joints.The maximum tensile shear force of the joint first increases and then decreases with the increase of welding current;the maximum tensile shear force reaches the maximum of 2.3 kN while the welding current is 14 kA.Al3Ti is formed at the aluminum-titanium interface,and the joint fractures in the heat-affected zone on the magnesium side.After conversi on,the shear strength of the joint can reach 156 MPa.SEM and EDS analysis shows that the addition of titanium interlayer blocks the mutual diffusion of magnesium alloy and aluminum alloy,and the titanium interlayer hinders the formation of Mg-Al intermetallic compounds,thereby greatly improving the bonding strength of the joint.

关 键 词：镁合金 铝合金 电阻点焊 钛中间层 

分 类 号：TG453.9[金属学及工艺—焊接]