Method for refurbishing nozzle block vanes of a steam turbine

Details Method for refurbishing nozzle block vanes of a steam turbine Method for refurbishing nozzle block vanes of a steam turbine

1990-04-09

1991-10-29

Ramsey, Kenneth J.

Metal fusion bonding

Process

Repairing, restoring, or renewing product for reuse

2940213, 29888011, 228166, F01D 512, B23P 604, B23K 3100

Patent

active

050608428

ABSTRACT:
Nozzle block vanes having damaged trailing edge sections are repaired by removing the damaged section and replacing it by a new forged replacement trailing end section. The replacement section is coated with an erosion resistant coating leaving an uncoated border on three sides, preferably beveled. The coated section is welded to the vane and walls of the nozzle block and the weld portion ground to give a uniform contour between the vane and replacement section. The block is heat treated or the heat affected zone heat treated to provide a repaired vane.

REFERENCES:
patent: 3650635 (1972-03-01), Wachtell et al.
patent: 4611744 (1986-09-01), Fraser et al.
patent: 4832252 (1989-05-01), Fraser
Welding Handbook, 7th Ed., vol. 1, (1976) pp. 273 and 330.
Metals Handbook, 9th Ed., vol. 6, (1983) p. 291.

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