| 摘要 |
<p>A method of lasing a filler wire (22) to weld a first workpiece (20) to a second workpiece (20) comprising first and second materials, respectively, includes positioning a tip (27) of the filler wire above an opening (29) defined by the workpieces. The tip extends over a width of the opening (29) and over a portion of each of the workpieces (20, 20). The filler wire (22) is preheated and melted by directing a laser beam (18) at the tip. The laser beam (18) is advanced along a length of the opening (29) with the tip (27) positioned under the laser beam (18) to form a high aspect ratio weld (37) between the workpieces (20, 20). The high aspect ratio weld (37) has an aspect ratio of at least about two. The energy and time required for the laser beam (18) to melt the filler wire (22) is reduced as the filler wire (22) is preheated.</p> |
