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

► Crack free electron beam welded TiAl alloy was obtained by composite control method. ► The weld obtained by composite control method was characterized by γm grain and γ/α2 colony. ► Grains in the weld was refined, which is help to reduce the local thermal stress. ► Increase of the deformed structure in the weld can release thermal stress.