【摘要】 针对钛/铝单面高速超威弧熔化极氩弧焊（FA-MIG）熔钎焊界面组织性能差异大的问题，采用激光对TC4钛/5A06铝FA-MIG焊接头的背面焊缝进行重熔处理，以改善Ti/Al界面显微组织的差异性，提高接头的力学性能。通过不同工艺下接头组织性能的对比分析，研究激光向铝侧偏移量d、激光功率q和焊接速率v对接头组织性能的影响。结果表明，d、q和v对接头组织性能具有重要影响；在d=2 mm,q=1.3 kW,v=5 mm·s^-1条件下，经重熔处理的接头根部TiAl₃界面反应层明显增厚，接头厚度方向Ti/Al界面显微组织差异明显降低；接头抗拉强度超过280MPa，比未经处理的接头提高了约20%；拉伸断口呈塑性+脆性混合型断裂。更多还原

【Abstract】 The critical problem that Ti/Al dissimilar single-sided high speed FA-MIG welding faced to is the great difference in Ti/Al interfacial structural properties. Laser remelting on the back weld was used to deal with the Ti/Al interfacial heterogeneity and improve the joint mechanical properties. Contrastive analysis was conducted to study the influence of laser offset to the Al side d, laser power q, and welding speed v on the joint structural properties. The results showed that the joint structural properties were greatly influenced by d, q, and v. With optimal parameters of d=2 mm,q=1.3 kW,v=5 mm·s^-1, the Ti/Al interfacial reaction layers thickness of the remelted joint root increased and difference in microstructure in the thickness-direction decreased; the tensile strength of the joint reached >280 MPa, which is approximately 20% higher than that of untreated joints; the tensile fractured surface exhibited fracture mechanism of plastic + ductile mixed.更多还原