Metal working – Method of mechanical manufacture – Impeller making
Patent
1991-12-09
1992-12-22
Cuda, Irene
Metal working
Method of mechanical manufacture
Impeller making
2940208, 228119, B21K 304
Patent
active
051724758
ABSTRACT:
A method for repairing a rotor includes severing the rotor into two or more rotor segments. After removing a portion of material including the crack from the rotor, weld metal is deposited onto the rotor until the removed portion is replaced with weld metal. A built-up portion is welded onto a surface positioned adjacent a bore of each of the rotor segments. One of the built-up portions is machined into a female spigot and the other build-up portion is machined into a male spigot for engagement of the rotor segments. The female and the male spigots are engaged for alignment of the rotor segments. The rotor segments are welded together with weld metal, which is deposited in a welding groove formed between the rotor segments and the spigots. After the rotor segments are joined together, the male spigot, the female spigot, and a portion of the weld metal positioned near the root fusion area are removed to restore the bore of the rotor to its original diameter.
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John W. Stanton and L. Doug Smith, "Diagnosis and Repair of a Cracked Double Flow LP Rotor at Florida Power & Light Company's Port Everglades Unit 2", presented May 28, 1987 in New Orleans, La.
J. N. Clark, D. Long, and K. D. Ryan, Workshop on Weld Repair of High-Pressure and Intermediate-Pressure Turbine Rotors for Life Extension"Welding Aspects of the Repair of a 350 MW IP Rotor", presented Dec. 1-2, 1987 in Palo Alto, Calif.
Amos Dennis R.
Clark Robert E.
Addessi Aileen C.
Cuda Irene
Westinghouse Electric Corp.
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