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AssigneeElectric Power Research Institute, Inc.
InventorsRonald E. Munson, Shane Joseph Findlan, David W. Gandy, Ramaswamy Viswanathan
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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.
A method of repairing a shrink-fitted turbine disc without removing said shrink-fitted turbine disc from a shaft, said method comprising the steps of:
A method of repairing a shrink-fitted turbine disc without removing said shrink-fitted turbine disc from a shaft, said method comprising the steps of:
A method of repairing a shrink-fitted turbine disc without removing said shrink-fitted turbine disc from a shaft, said method comprising the steps of:
A method of repairing a shrink-fitted turbine disc without removing said shrink-fitted turbine disc from a shaft, said method comprising the steps of:
Dependencies are inferred from the claim text.