| 摘要 |
Blades (20) are friction welded onto a disc (10) to form an integrally bladed rotor. To prevent the formation of defects in the weld interface between the blades (20) and the disc (10) a shielding gas is used. The shielding gas is introduced via two nozzles (22,24). The nozzles (22,24) are circumferentially spaced apart and located on opposite sides of the weld interface. The two gas flows oppose one another to create a curtain of gas, which flows around the weld interface. The gas curtain shields the weld interface from air and so reduces the formation of defects due to oxidation.
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