Turbine disk preform, welded turbine rotor made therewith and methods of making the same

摘要

A method (100) of making a turbine rotor is disclosed. The method includes forming a last stage disk preform (36) having a disk axis (44), the preform having a rotor face (46) and an opposed shaft face (48), the rotor face (46) having a circumferential, axially-extending rotor rib (50) protruding therefrom, the shaft face having a circumferential, axially-extending shaft rib (56) protruding therefrom, the disk preform comprising a disk preform material (76). The method also includes joining the rotor rib (50) to a rotor preform (13) to form a rotor joint (52), the rotor preform (13) comprising a rotor preform material (78). The method further includes joining the shaft rib (56) to a shaft (60) to form a shaft joint (58), the shaft comprising a shaft material (74), wherein the disk preform material (76) is different than the rotor preform material (78) and the shaft material (74).