B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/67
B23K 9/10 (2006.01) B23K 9/09 (2006.01)
Patent
CA 1273408
L-7434 METHOD AND DEVICE FOR CONTROLLING A SHORT CIRCUITING TYPE WELDING SYSTEM 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 con- dition 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 pre- selected time, then allowing the welding current to reach the normal unimpeded current level, and causing the hold- ing step to be terminated before the selected time in response to a detected arc condition. This concept provides a pre- determined low current condition immediately upon establish- ing 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 back- ground 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.
530547
Parks John M.
Stava Elliott K.
Gowling Lafleur Henderson Llp
Lincoln Electric Company (the)
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