Metal working – Method of mechanical manufacture – Impeller making
Patent
1999-05-28
2000-11-14
Cuda, Irene
Metal working
Method of mechanical manufacture
Impeller making
298897, B23P 1500
Patent
active
061451940
ABSTRACT:
A method for repairing a shrink-fitted turbine disc without removing the disc from the shaft. The method is composed of two basic steps: (1) depositing one or more weld layers in a vicinity of a defective region of the disc using a temperbead welding process and (2) heat treating the disc using an induction heating process. In a first embodiment of the method, the heat treating step includes heating a heat-affected zone of the disc in a vicinity of the one or more weld layers to a temperature T.sub.h, heating a rim region of the disc to a temperature T.sub.r and heating a bore region of the disc to a temperature T.sub.b, where T.sub.h, T.sub.r >T.sub.b. In a second embodiment of the method, the heat treating step includes heating a region of the disc in a vicinity of the one or more weld layers using the induction heating process and concurrently cooling a bore region of the disc. In a third embodiment of the method, the heat treating step includes heating at least a portion of the disc using the induction heating process and concurrently heating the shaft to maintain a predetermined temperature differential between the bore region of the disc and the shaft. In a fourth embodiment of the method, the heat treating step includes heating at least a portion of the disc using the induction heating process and concurrently heating the shaft to maintain a uniform temperature between the bore region of the disc and the shaft.
REFERENCES:
patent: 5839643 (1998-11-01), Inoue et al.
patent: 5945013 (1999-08-01), LaFave
patent: 6049979 (2000-04-01), Nolan et al.
Findlan Shane Joseph
Gandy David W.
Munson Ronald E.
Viswanathan Ramaswamy
Cuda Irene
Electric Power Research Institute Inc.
Galliani William S.
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