Research on the Laser Lap Welding of TC4 Titanium Alloy and L3 Industrial Pure Aluminum Dissimilar Metal

摘要

Investigated on TC4 titanium alloy and L3 pure aluminum laser welding of dissimilar metal, the width We of the lap joint was crucial for joint strength, and increased with the increasing of heat input, but if heat input was too high, the back of aluminum would burning loss, the joint strength would decline. Welding structures were related with penetration ratio θ, the larger the penetration ratio was, the easier the intermetallic compound formed, and the joint cracking and hardness were influenced. Choosing appropriate laser parameter, controlling aluminum melting amount, and ensuring joint width We, could acquire welding joint of meeting the need.