More creep resistant turbine rotor, and procedures for repair we

Details More creep resistant turbine rotor, and procedures for repair we More creep resistant turbine rotor, and procedures for repair we

1989-03-20

1990-09-25

Rosenbaum, Mark

Metal working

Method of mechanical manufacture

Impeller making

2988971, 2940209, 2940218, 2940219, B22D 600

Patent

active

049584316

ABSTRACT:
A more creep resistant turbine rotor and novel methods for repairing worn surfaces of Cr-Mo-V steam turbine components are disclosed. These methods include specified alloy compositions and welding procedures that minimize weld stresses and cracking. These alloys exhibit improved creep and fatigue properties and are preferably deposited using a gas tungsten arc welding procedure. Bead sequencing, cooling side plates and the use of run-off tabs are also disclosed for minimizing welding defects in turbine rotors and discs.

REFERENCES:
patent: 3650635 (1972-03-01), Wachtell et al.
patent: 3797085 (1974-03-01), Aartman
patent: 4213025 (1980-07-01), Kuhnen
patent: 4219717 (1980-08-01), Kuhnen
patent: 4633554 (1987-01-01), Clark et al.
patent: 4657171 (1987-04-01), Robuns
patent: 4726101 (1988-02-01), Draghi et al.
Clark, R. E., et al, "Experiences with Weld Repair of Low Pressure Steam Turbine Rotors", 47th American Power Conference, Chicago, Illinois, Printed by Westinghouse Electric Corporation, Power Generation, Orlando, Florida.
Clark, R. E., et al, "Development of the Techniques for High Pressure Rotor Weld Repair", Westinghouse and Mitsubishi Tech. Seminar, Takasago, Japan, Jul. 1987, Propietary Document of Westinghouse.

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