钛/铝异质金属搅拌摩擦焊技术研究进展

Titanium and aluminum alloys have been widely applied to aircraft, military and automobiles industries due to their significant advantages such as weight savings, high strength-to-weight ratio and resistance to corrosion. The joining technology for the Ti/Al composite structure is becoming a hot research point. However, Ti/Al joints are difficult to weld, accompanied by appearance and mechanical problems, owing to their significant differences in physical and chemical properties. As a solid-state welding process, Friction Stir Welding (FSW) has tremendous advantage in overcoming the welding problems induced by dissimilar materials. In this paper, the current research status of Ti/Al friction stir welding is reviewed, including weld formation, welding parameters, mechanical properties, metallurgical bonding mechanisms for varied joint morphology from button joint, lap joint to spot joint. Latest research on new technology for Al/Ti welding is also discussed, giving new insight into the lightweight design of the Ti/Al heterogeneous structure. The development trend of joining technology for the structure is forecasted.