Electric heating – Metal heating – By arc
Patent
1995-08-01
1997-09-09
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
21912164, B23K 2608
Patent
active
056652550
ABSTRACT:
Metal alloy workpieces are laser welded to one another with a laser head emitting a laser beam. The laser head and workpieces 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 andr amplitude. An oscillating motion of the laser beam is superimposed on top of the relative velocity of movement between the laser head and the workpieces 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 so that as the laser head moves along the weld path at a constant velocity, the laser beam is oscillated to thereby cause the laser beam to at least slow down relative to the velocity of travel between the laser head with respect to the workpieces along the weld path during backward oscillatory movement of the laser beam.
REFERENCES:
patent: 4665294 (1987-05-01), Hira et al.
patent: 4746540 (1988-05-01), Kawasaki et al.
patent: 4760240 (1988-07-01), Iikawa et al.
Evans Geoffrey S.
Progressive Tool & Industries Company
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