(1. National Key Laboratory of Science and Technology on Helicopter Transmission; Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China; 2. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China)
Abstract：Double laser-beam bilateral synchronous welding (DLBSW) of T-joints for light alloy is an advancing technology with promising applications and potential development. It is significant for the aerospace panel structures in the lightweight and efficient manufacturing. However, there are still many unresolved details in DLBSW technology of T-joint for light alloy owing to the material properties of light alloy and the particularity of DLBSW technology. In this paper, the welding metallurgy characteristics and stability of DLBSW process for light alloy T-joints are analyzed. The formation mechanism and suppression measures for welding defects in DLBSW T-joint are emphatically researched. The mechanical properties and fracture mechanism of the T-joint are investigated. Besides, the significance of the numerical simulation study on DLBSW of T-joints for light alloy is discussed.