B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/45
B23K 9/09 (2006.01)
Patent
CA 1152162
GAS METAL ARC WELDING SYSTEM ABSTRACT OF THE DISCLOSURE Power delivered to the welding arc from a constant current rapid response power supply is controllable to maximize arc stability particularly in out-of-position welding operations. A first control modulates the output current from the power supply between a high value close to the maximum output value and a minimum value just sufficient to maintain the welding arc. This modulation is effected at a given frequency appropriately adjusted in accordance with the electrode material and diameter to maintain optimum spray metal transfer in the welding arc. A further control is effected by pulse width modulating the output from the power supply in accord with a set-in current programmed signal which is compared with a current feedback signal or, alternatively, a set in voltage programmed signal which is compared with a voltage feedback signal. This latter con- trol provides for operation of the power supply in a constant current control mode or alternatively, a constant voltage control mode. Still further control of the power in the welding are is effected by pulsing the current be- tween base and peak levels at a relatively low frequency which enables control of the weld puddle in out-of-weld positions.
382986
Kimbrough Andrew G.
Rothermel Ronald R.
Viri Donald P.
Dimetrics Inc.
Smart & Biggar
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