More creep resistant turbine rotor, and procedures for repear we

Details More creep resistant turbine rotor, and procedures for repear we More creep resistant turbine rotor, and procedures for repear we

1988-03-14

1990-01-30

Shaw, Clifford C.

Electric heating

Metal heating

For deposition welding

228119, B23K 904

Patent

active

048975192

ABSTRACT:
A more creep resistant turbine rotor and novel methods for repairing worn surfaces of Cr-Mo-V steam turbine components are disclosed. These methods include specified alloy compositions and welding procedures that minimize weld stresses and cracking. These alloys exhibit improved creep and fatigue properties and are preferably deposited using a gas tungsten arc welding procedure. Bead sequencing, cooling side plates and the use of run-off tabs are also disclosed for minimizing welding defects in turbine rotors and discs.

REFERENCES:
patent: 4213025 (1980-07-01), Kuhnen
patent: 4219717 (1980-08-01), Kuhnen
patent: 4633554 (1985-08-01), Clark et al.
Clark, R. E., et al., "Experiences with Weld Repair of Low Pressure Steam Turbine Rotors", 47th American Power Conference, Chicago, Ill., printed by Westinghouse Electric Corporation, Power Generation, Orlando, Fla.
Clark, R. E., et al, "Development of the Techniques for High Pressure Rotor Weld Repair", Westinghouse and Mitsubishi Tech. Seminar, Takasago, Japan, Jul. 1987, proprietary document of Westinghouse.

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