ABSTRACT The dissimilar material of AZ31 Mg alloy and TA15 Ti alloy were welded by resistance spot welding. The influence of welding current on the interface of nuggets is studied. The microstructure, hardness, tensile strength and fracture surface of joints are analysed. The results indicate that when the electrode pressure and welding time are determined, the failure load of the joint can be improved by the increase in the welding current; however, excessively high welding current will cause cracks near the interface. Under the welding current of 14.5 kA, the electrode pressure of 0.22 MPa and the welding time of 200 ms, the maximum failure load of the joint can reach 4.79 kN, which is almost the same as the shear strength of AZ31B magnesium alloy base metal.

中文翻译：

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Mg/Ti异种材料电阻点焊组织与性能研究

摘要 采用电阻点焊对AZ31镁合金和TA15钛合金异种材料进行焊接。研究了焊接电流对熔核界面的影响。分析了接头的显微组织、硬度、抗拉强度和断裂面。结果表明，当电极压力和焊接时间确定时，增加焊接电流可以改善接头的失效载荷；但是，过高的焊接电流会导致界面附近出现裂纹。在14.5 kA的焊接电流、0.22 MPa的电极压力和200 ms的焊接时间下，接头的最大破坏载荷可达4.79 kN，与AZ31B镁合金母材的剪切强度几乎相同。