Electric heating – Metal heating – By arc
Patent
1981-04-09
1983-05-17
Shaw, C. C.
Electric heating
Metal heating
By arc
21913021, 21913031, B23K 909
Patent
active
043841872
ABSTRACT:
A feedback control system for a pulsed direct current (DC) arc welding system is disclosed wherein the duty cycle of current pulses supplied by a power supply is controlled in response to resistance sensed at the arc gap of the system. The circuit comprises a voltage sensor, a high-low regulator, and a pulse width signal generator. The voltage sensor senses the voltage drop across the arc gap. This voltage is directly proportional to the resistance at the arc gap. The high-low regulator responds to the sensed voltage to generate an output signal when the voltage drop across the arc gap exceeds a high limit or is below a low limit. This output signal alters the control signal from the pulse width signal generator which controls the arc welding system power supply. The control signal from the generator is altered so that the duty cycle of the current pulses is adjusted, in response to changes in the resistance sensed at the arc gap, to maintain a constant time averaged power flow to the work pieces at the arc gap. The form of the current pulses, including peak current level, is unchanged except for the duty cycle adjustment.
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Jackson Dale E.
Wright, Jr. William E.
Adour David L.
Carrier Corporation
Daley Donald F.
Shaw C. C.
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