| 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 operatio n, the laser head (16) and workpieces (12, 14) are moved relative to one anothe r 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 t op 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 molt en metal is controlled to a predetermined rate. A stroke rate of the oscillatin g motion is synchronized with the frequency of the modulated power output.</SD OAB> |
