Effect of Ni Addition on the Interfacial Strength of Al/Cu Dissimilar Welds Produced by Friction Stir Lap Welding

Al/Cu dissimilar joining is a key technology for reducing the weight and cost of electrical components. In this study, friction stir lap welding (FSLW) Ni-containing Al alloy to pure Cu was performed, effects addition Ni on weld strength interfacial microstructure were examined. A thin intermetallic compound (IMC) layer observed at interface produced by FSLW. The 3 at.% effectively improved strength, although thickness IMC increased. formed without comprised CuAl2 Cu9Al4 from side. contrast, with consisted (Ni,Cu)Al, CuAl, eliminated weak CuAl2/Cu9Al4 interface, thereby improving strength. results study suggest that can be thinning caused FSLW change in addition.