Patent ID: 6495793
Filing Date: 2002-12-17
Classification: B23K,B23P,C23C,F01D

Abstract:
A laser repair method for repairing a Ni base superalloy substrate surface having a gamma prime content of at least about 30 volume % comprising the steps of:providing and maintaining the substrate surface at ambient temperature; providing a laser with a laser beam that operates at least in a power range of about 50-10000 watts per square centimeter; disposing the laser in juxtaposition with the substrate surface; focusing the laser beam at a point away from the substrate surface to provide a laser spot on the substrate surface in the size range of about 0.03-0.2â€³; providing a relative movement between the substrate surface and the laser spot to provide an interaction time of no greater than about 10 seconds between the laser beam and the substrate surface while concurrently operating the laser beam in the power range and concurrently depositing a repair alloy powder in the laser beam to melt and fuse the repair alloy powder into a molten repair alloy and deposit the molten repair alloy on the substrate surface; and, cooling the molten repair alloy to provide a weld bead.