Electric heating – Metal heating – By arc
Patent
1986-12-11
1988-01-05
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219137PS, B23K 909
Patent
active
047178078
ABSTRACT:
A method and device for controlling a power supply for arc welding in a manner to reduce spatter when the power supply is employed for depositing metal from a welding wire or electrode onto a workpiece by the short circuiting transfer mode wherein a welding current causes the welding wire to alternate between a short circuit condition and an arc condition with metal transfer occurring during a short circuit condition. This method and device includes the concept of shifting the welding current to a background current value in response to a short circuit condition, holding the welding current generally at the background current level for a preselected time, then allowing the welding current to reach the normal unimpeded current level, and causing the holding step to be terminated before the selected time in response to a detected arc condition. This concept provides a predetermined low current condition immediately upon establishing a short circuit between the welding wire or electrode and the workpiece, which low current condition is retained long enough to convert what otherwise would be a spatter-laden momentary short circuit to a short circuit where metal is transferred to the workpiece. Further, the method and device detects the slope of the welding current or voltage and shifts the welding current to the low background current level when the welding current reaches its maximum value just before breakage of the metal from the wire thus reducing the spatter energy when the molten metal breaks from the wire.
REFERENCES:
patent: 3792225 (1974-02-01), Needham et al.
patent: 3809853 (1974-05-01), Manz
patent: 4544826 (1985-10-01), Nakanishi et al.
patent: 4546234 (1985-10-01), Ogasawara et al.
P. Budai et al., "A Power Source for Advanced Systems", 1st International Conf. on Advanced Welding Systems,. 11/1985.
T. Ogasawara et al., "A Power Source for Gas Shielded Arc Welding with New Current Wave Forms", 1st Int. Conf. on Advanced Welding Systems, 11/1985.
Publication entitled Control of Short Cirtuiting in MIG-Welding, published in Welding Research International, 1974 Edition.
Parks John M.
Stava Elliott K.
Shaw Clifford C.
The Lincoln Electric Company
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