| 摘要 |
A titanium-aluminide turbine wheel ( 120, 220, 320, 420 ) is joined to the end of a shaft ( 110, 210, 310, 410 ) by utilizing a titanium surface on the end of the shaft to be joined to the wheel, and electron-beam welding the wheel onto the titanium surface on the shaft. A steel shaft ( 110, 310, 410 ) can have a titanium-containing end piece (130, 330, 430) mechanically joined (by brazing, bonding, or welding) to the end of the shaft, and the end piece can be directly electron-beam welded to the wheel. Alternatively, the shaft ( 210 ) can be formed as a titanium member and the end ( 212 ) of the shaft can be directly electron-beam welded to the wheel ( 220 ). In another embodiment, a ferrous end piece ( 330 ) is mechanically joined to the titanium-aluminide turbine wheel ( 320 ) and then the end piece is directly electron-beam welded to the end of a steel shaft ( 310 ). Alternatively, a silver-titanium alloy member ( 430 ) is sandwiched between the wheel ( 420 ) and a steel shaft ( 410 ) and is melted to join the parts together.
|
