| 摘要 |
A method for providing a pre-welding heat treatment to a workpiece surface is described wherein the method includes the steps of: generating through a laser generator a laser beam characterized by a power and focal point; positioning the laser generator such that the focal point of the laser beam is above the workpiece surface so as to generate a defocused laser beam; directing the defocused laser beam toward the workpiece surface so as to project a laser beam spot on the workpiece surface; scanning the laser beam spot over the workpiece surface thereby heating the workpiece surface so as to provide a pre-welding heat treatment; repositioning the laser generator such that the focal point of the laser beam is changed; and laser welding the workpiece with substantially the same power as in the generating step. The method is further adapted for use with a hand held Nd:YAG laser torch, and the workpiece may be a superalloy gas turbine engine component.
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