| 摘要 |
A laser beam (14) is focussed at point (18) away from a substrate surface (12) at ambient temperature to provide a laser spot (20). Relative movement between the substrate surface and the laser spot is provided to provide an interaction time of 10 seconds or less between the beam and surface while operating the beam and depositing repair alloy powder (22) to melt and fuse the powder into a molten alloy which is deposited on the surface and cooled to form a weld bead. The substrate surface is maintained at an ambient temperature and a laser with a laser beam which operates at least in a power range of 50-10000 W/cm2>, is provided. The laser is arranged in juxtaposition with the substrate surface. The laser beam is focussed at a point away from the surface to provide a laser spot on the surface of size 0.03-0.2 inches. Relative movement between the surface and the laser spot is provided to provide an interaction time of not greater than 10 seconds between the laser beam and the 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 surface. The molten repair alloy is then cooled to provide a weld bead. |
