Research progress on brazing and welding-brazing of titanium alloy and aluminum alloy dissimilar metals

Titanium alloy and aluminum alloy are widely used in industries such as aerospace, ships, and automobiles, and titanium/aluminum connection structures are also receiving increasing attention. Weldability of titanium alloy and aluminum alloy dissimilar metals was analyzed in the paper, current research status of brazing and welding-brazing methods for titanium alloy and aluminum alloy dissimilar metals at home and abroad was emphatically discussed. It was pointed out that there were significant differences in the physical and chemical properties between titanium alloy and aluminum alloy. Currently, there were still difficulties in avoiding formation of brittle Ti/Al intermetallic compounds during brazing, and uneven distribution of microstructure in joints between titanium alloy and aluminum alloy that was easily caused by uneven heat input during welding-brazing. Through changing type, composition ratio and welding parameters of brazing filler metal, generation of brittle Ti/Al intermetallic compounds could be effectively reduced. During welding-brazing, methods such as selecting appropriate welding methods and welding processes or filling weld with metal could be used to reduce generation of brittle Ti/Al intermetallic compounds. Finally, prospects for development and research directions of brazing and welding-brazing of titanium and aluminum alloy dissimilar metals were proposed.