Control system and method for dc pulse modulated arc welding

H - Electricity – 05 – B

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H05B 7/148 (2006.01) B23K 9/067 (2006.01) B23K 9/09 (2006.01)

Patent

CA 1184253

Control System and Method for DC Pulse Modulated Arc Welding Abstract A method of pulsed direct current (DC), arc welding with a feedback control system is disclosed wherein the duty cycle of current pulses supplied by a power supply is controlled in response to resistance sensed at an arc gap to maintain a constant time-averaged power flow to work pieces which are welded. The feedlock control system includes a voltage sensor, a high-low regulator, and a duty cycle signal generator. This pulsed DC arc welding is especially useful with a type of pulsed DC arc welding wherein the ratio of peak current to maintenance current is maintained at a selected high value and the current is cycled in a time duration whereby oxides on the surface of the work pieces are dissipated when making the weld. Also, a control system is disclosed for automatically adjusting pulse width of current pulses supplied at an arc gap by a pulsed DC arc welding system power supply, to control power flow to work pieces at the arc gap.

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