Patent ID: 8961144
Filing Date: 2015-02-24
Classification: B23K,F01D,Y10T

Abstract:
1. A method of making a turbine rotor, comprising: forming a last stage disk preform configured for attachment to a low pressure end of a turbine rotor preform, the last stage disk preform having a disk axis, the preform having a rotor face and an opposed shaft face, the rotor face having a circumferential, axially-extending rotor rib protruding therefrom, the shaft face having a circumferential, axially-extending shaft rib protruding therefrom, the disk preform comprising a disk preform material, the last stage disk preform comprising the outermost, or L0, disk preform configured to receive turbine buckets on the turbine rotor; joining the rotor rib to the end of the rotor preform to form a rotor joint, the rotor preform comprising a rotor preform material, the joining comprising double-wire welding using a first weld wire comprising the disk preform material located proximate the disk preform and a second weld wire comprising the rotor preform material located proximate the rotor preform; and joining the shaft rib to a turbine shaft to form a shaft joint, the turbine shaft comprising a shaft material, wherein the disk preform material is different than the rotor preform material and the shaft material.