Patent ID: 7287960

Claim:
A rotor shaft assembly ( 10 ) comprising: a titanium aluminide rotor ( 20 ) comprising an axial protruded portion ( 40 ) having a wall ( 200 ) and a distal end ( 300 ); and a metal shaft ( 30 ) comprising a recessed axial portion ( 50 ) adapted to accept said protruded portion ( 40 ), wherein said protruded portion ( 40 ) and said recessed portion ( 50 ) are joined by a brazed joint ( 60 ) and an interference fit, wherein the brazed joint ( 60 ) is between the wall ( 200 ) and the recessed axial portion ( 50 ), wherein a braze channel ( 90 ) is formed by cross-hatching at least one of the wall ( 200 ) of the protruded portion ( 40 ) or the recessed portion ( 50 ), and wherein the cross-hatching comprises at least one helical channel.