Dissimilar joints of copper and aluminium alloy were generated by electric current assisted ultrasonic welding (EUSW). The microstructure characteristics and mechanical properties of Cu/Al EUSW joints were systematically investigated. The electric current promoted the plastic flow at the welding interface. The intermetallic thickness increased with electric current. The microstructure characteristics of Cu/Al joints welded by EUSW were compared with those of the Cu/Al joints welded by ultrasonic welding (USW). A thinner intermetallic compound layer could be obtained at the more fully material mixing during EUSW. The Cu/Al joints welded by EUSW displayed ultimate tensile strength 12% and fracture energy 21% greater than those of the Cu/Al joints welded by USW. The reasons for the improvement in mechanical properties of the Cu/Al EUSW joints have been discussed.

通过电流辅助超声波焊接 (EUSW) 生成铜和铝合金的异种接头。系统地研究了 Cu/Al EUSW 接头的微观结构特征和力学性能。电流促进了焊接界面处的塑性流动。金属间化合物的厚度随着电流的增加而增加。将 EUSW 焊接的 Cu/Al 接头与超声波焊接 (USW) 焊接的 Cu/Al 接头的显微组织特征进行比较。在 EUSW 期间，材料混合更充分，可以获得更薄的金属间化合物层。EUSW 焊接的 Cu/Al 接头显示出比 USW 焊接的 Cu/Al 接头高 12% 的极限抗拉强度和 21% 的断裂能。