B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
26/151, 327/45,
B23K 31/00 (2006.01) B23K 9/04 (2006.01) B23K 9/23 (2006.01) B23K 15/00 (2006.01) B23K 26/34 (2006.01) F01D 5/00 (2006.01)
Patent
CA 1320542
- 21 - 54,134 ABSTRACT Novel methods for repairing worn surfaces of steam turbine components and especially high pressure turbine rotors, are disclosed. The e methods include depositing a first layer of weld metal on a worn surface of the component, whereby a heat-affected zone is created. A second layer of weld metal is then deposited over the first layer using a greater amount of heat to temper at least a portion of the heat-affected zone produced by the first layer. The preferred embodiments include the use of gas tungsten arc welding for producing fine-grain size and more creep resistance, especially in the weld and heat-affected zone. The resulting build-up can be machined, for example into a blade fastening to produce a component having properties equal to or better than the base-metal alloy. The invention also provides a longer lasting turbine system including rotors which have serrated steeples that are more resistant to failure.
597776
Amos Dennis Ray
Clark Robert Edward
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Westinghouse Electric Corporation
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