Crack formation and control upon the electron beam welding of TiAl-based alloys

Electron beam welding experiments on 2.5-mm-thick as-forged Ti–43Al–9V–0.3Y intermetallic plates were carried out. Cold cracking occurred in the direct electron beam welding joints because of the brittleness of the microstructure and the residual stress. A crack-free electron beam welding joint was obtained by a new composite control method. This process can prolong the high temperature stage to promote the phase transformation and to give the...