| 摘要 |
Metal alloy workpieces (12, 14) are laser welded to one another with a laser head (16) emitting a laser beam (18) and a servo motor (34) is attached to a linkage (36) that imparts oscillatory motion to laser head (16). In operation, the laser head (16) and workpieces (12, 14) are moved relative to one another at a predetermined velocity along a weld path. The laser beam power is selectively modulated to have an output with a desired frequency and/or amplitude. An oscillating motion of the laser beam (18) is superimposed on top of the relative velocity of movement between the laser head (16) and the workpieces (12, 14) along the weld path, such that a rate of cooling of molten metal is controlled to a predetermined rate. A stroke rate of the oscillating motion is synchronized with the frequency of the modulated power output. |
