Turbine system having more failure resistant rotors and repair w

Details Turbine system having more failure resistant rotors and repair w Turbine system having more failure resistant rotors and repair w

1988-05-05

1990-02-27

Godici, Nicholas P.

Metal fusion bonding

Process

Repairing, restoring, or renewing product for reuse

228160, 219 7614, 21912145, 2940218, 298891, B23K 3100

Patent

active

049038885

ABSTRACT:
Novel methods for repairing worn surfaces of turbine rotors, are disclosed. These methods include depositing a first layer of weld metal on a worn surface of the component, whereby a heat-affected zone is created. A second layer of weld metal is then deposited over the first layer using a greater amount of heat to temper at least a portion of the heat-affected zone produced by the first layer. The preferred embodiments include the use of gas tungsten arc welding for producing fine-grain size and more creep resistance, especially in the weld and heat-affected zone. The resulting build-up can be machined, for example into a blade fastening to produce a component having properties equal to or better than the base-metal alloy. The invention also provides a longer lasting turbine system, including rotors which have serrated steeples that are more resistant to failure.

REFERENCES:
patent: 4159410 (1979-06-01), Cooper
patent: 4213025 (1980-07-01), Kuhnen
patent: 4219717 (1980-08-01), Kuhnen
patent: 4633554 (1985-08-01), Clark et al.
patent: 4657171 (1987-04-01), Robins
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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