This study systematically characterized the microstructure, phase transformation, and mechanical properties of Ti65 titanium alloy T-joints welded using dual-beam laser with Ti65 welding wire as filler. The welded joint exhibits distinct zones: the base material retains a fine duplex α-phase microstructure; the heat-affected zone (HAZ) shows grain coarsening and phase transformation; and the fusion zone (FZ) forms needle-like α′ martensite due to rapid cooling-induced β-phase transformation. Elemental analysis confirms uniform alloy distrib...
