Electric heating – Metal heating – By arc
Patent
1997-12-18
1999-08-03
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
148525, 21912161, 21912184, B23K 2600
Patent
active
059321202
ABSTRACT:
A method of laser shock peening a gas turbine engine object continuously firing a stationary laser beam, which repeatably pulses between relatively constant periods, on a portion of the object with a low power laser beam, on the order of 3-10 joules, to vaporize material on the surface of a portion of a part made of a strong hard metal, such as a titanium alloy. Laser pulses around small laser beam spots, on the order of 1 mm in diameter, are used to vaporize material on the surface of the portion of the object with the pulses around laser beam spots formed by the laser beam on the surface and form a region having deep compressive residual stresses extending into the object from the laser shock peened surface. Flowing a curtain of water over the surface upon which the laser beam is firing while preferably moving the object until the laser shock peened surface is completely covered by laser beam spots at least once. The surface may be coated with an ablative coating such as a paint which is suitable to produce the plasma or the surface may be unpainted and the metal of the object is used to produce the plasma.
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Kelley James G.
Mannava Seetharamaiah
Rockstroh Todd J.
Evans Geoffrey S.
General Electric Company
Herkamp Nathan D.
Hess Andrew C.
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