Ultrasonic spot welding of Ti6Al4V and TiNi shape memory alloy (SMA) dissimilar joints with an Al coating interlayer were investigated. The influence of welding pressures on the macro/microstructures and tensile shear properties were evaluated. The results show that successful joining of Ti6Al4V and TiNi SMA dissimilar materials can be achieved by selecting proper welding pressure. Intermetallic compounds such as Al₃Ti were formed in the dissimilar material joints. The tensile shear loads of the joints were increased first then decreased as the welding pressure continually increasing. When the welding pressure and welding time is 0.52 MPa and 0.5 s respectively, the tensile shear load was 931 N. The dissimilar alloy joints failure at the interface of Al coating and TiNi SMA with a brittle fracture mode.

研究了带有Al涂层夹层的Ti6Al4V和TiNi形状记忆合金（SMA）异种接头的超声点焊。评估了焊接压力对宏观/微观结构和拉伸剪切性能的影响。结果表明，通过选择合适的焊接压力可以成功地连接Ti6Al4V和TiNi SMA异种材料。在异种材料接头中形成了金属间化合物，例如Al ₃ Ti。随着焊接压力的不断增加，接头的拉伸剪切载荷先增大，然后减小。当焊接压力和焊接时间分别为0.52 MPa和0.5 s时，拉伸剪切载荷为931N。在Al涂层和TiNi SMA的界面处，异种合金接头失效，并具有脆性断裂模式。