Microstructure and tensile properties of laser beam welded Ti–22Al–27Nb alloys

Ti–22Al–27Nb alloys were welded using the laser beam welding process. The microstructure characterization and the tensile properties of the laser beam welded joints were investigated. The experimental results showed that a well-quality joint could be obtained using laser beam welding method. The fusion zone of the welded joint was composed of B2 phase. The tensile strength of the joints at room temperature was basically comparable to that of the base metal and the tensile ductility of the joints achieved 56% of the base metal. The average tensile strength of the welded joints at 650 °C was tested to be about 733 MPa, with the elongation of 2.93%.

► A well-quality joint is obtained by laser beam welding Ti–22Al–27Nb alloys.
► The weld metal only consists of B2 phase.
► The tensile strength of the joints is 94% of the base metal at room temperature.
► Limited number of O phase slip systems causes the ductility loss at 650 °C.