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

1989-05-11

1990-07-10

Garrett, Robert E.

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Coating, specific composition or characteristic

415200, F04D 2902

Patent

active

049403907

ABSTRACT:
System for repairing worn surfaces of steam turbine components and especially high pressure turbine rotors, are disclosed. These systems 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 providing 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: 3564689 (1971-02-01), Hirtenlechner
patent: 4273512 (1981-06-01), Weiler
patent: 4406698 (1983-09-01), Yebisuya et al.
patent: 4429019 (1984-01-01), Schrewelius
patent: 4499158 (1985-02-01), Onuma et al.
patent: 4813806 (1989-03-01), Minami et al.
patent: 4832993 (1989-05-01), Coulon

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