Effect of Ti, Zr, and Cu content on the microstructure and properties of 2195 Al-Li alloy weldment

2195 Al-Li alloy was welded using six kinds of weld filler wires with different contents of zirconium, titanium, and copper. The S2503 weld demonstrated fine α -Al/Al 2 Cu/Al 3 (Ti, Zr) microstructure and superior mechanical properties. The addition of Zr and Ti refined the grain and modified the solidification mode of the weld metal. With the increase of Ti/Zr addition in the fusion zone, the tensile strength and corresponding elongation of the Al-Li weld increased significantly. The excessive Al 2 Cu at the grain boundary helped to alleviate the cracking sensitivity by a “self healing” mechanism, but greatly deteriorated the impact toughness of the weld joint. Graphical Abstract