Adhesive Tape Covered Laser Shock Peening

Author:  Mannava et al.
Source:  US Patent 5,674,329
Doc ID:  1996148
Year of Publication:  1996
Abstract:  
A method of laser shock peening a metallic part by firing a laser on a laser shock peening surface of the part which has been adhesively covered by a tape having an alblative medium, preferably self adhering tape with an adhesive layer on one side of an alabative layer, while flowing a curtain of water over the surface upon which the laser beam is firing. Continuous movement is provided between the part and the laser beam while continuously firing the laser beam, which repeatably pulses between relatively constant periods, on a laser shock peening surface of the part. Using a laser beam with sufficient power to vaporize the ablative medium so that the pulses form laser beam spots on the surface and a region having deep compressive residual stresses imparted by the laser shock peening process extending into the part from the surface.