Method of repairing damaged turbine rotor wheels using different

Details Method of repairing damaged turbine rotor wheels using different Method of repairing damaged turbine rotor wheels using different

1998-11-27

2000-10-10

Cuda, Irene

Metal working

Method of mechanical manufacture

Impeller making

2940213, 2940216, B23P 1500

Patent

active

061288209

ABSTRACT:
A method of repairing a turbine rotor wheel having a damaged dovetail includes removing the damaged dovetail from the turbine wheel, leaving a turbine wheel body and welding a ring about the turbine wheel body in place of the removed damaged dovetail. During the welding process, including during preheating, welding or stress relieving, the temperature of the wheel body and ring is differentially controlled to introduce residual stresses in the ring. After welding a dovetail is formed in the ring for receiving turbine bucket dovetails. As a result, the ring has residual compressive stresses in a cold condition of the turbine whereby reduced net stresses in the ring in the location of the new dovetail during hot turbine operating conditions are reduced.

REFERENCES:
patent: 5575145 (1996-11-01), O'Neill et al.
patent: 5755031 (1998-05-01), Baumgarten et al.
patent: 5765993 (1996-11-01), Weiss

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