Repair of combustion turbine components

Metal working – Method of mechanical manufacture – Impeller making

Reexamination Certificate

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Details

C029S402110, C029S402130, C029S402160

Reexamination Certificate

active

07146725

ABSTRACT:
A method of repairing a combustion turbine component having damage located at or near a cooling hole or hollow or geometrically complex portion of the component is provided. The method comprises forming a preparatory groove that extends from a surface of the component to the damaged area but does not extend to the cooling hole or hollow or geometrically complex portion of the component, the groove extending 40–90% the distance from the component to the damaged area; spraying a filler material into the groove with a micro-plasma torch at a current of less than 50 amperes; and filling the groove with the filler material such that the heated filler material substantially extends from the cooling hole or hollow or geometrically complex portion of the component to a surface of the component.

REFERENCES:
patent: 4611744 (1986-09-01), Fraser et al.
patent: 4878953 (1989-11-01), Saltzman et al.
patent: 5395584 (1995-03-01), Berger
patent: 5556560 (1996-09-01), Ahola
patent: 5913555 (1999-06-01), Richter
patent: 6129795 (2000-10-01), Lehockey
patent: 6197178 (2001-03-01), Patel
patent: 6264817 (2001-07-01), Timoshenko
patent: 6376801 (2002-04-01), Farrell
patent: 6884964 (2005-04-01), Murphy
Sermatech International Incorporated, Turbine Life Cycle Support Services/Steam Turbines, Sermatech Website : Steam Turbine Repair (www.lehrprecision.com/repair—steam), 1 page.

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