Alternating current arc welder

Details Alternating current arc welder Alternating current arc welder

1974-03-27

1976-11-30

Truhe, J. V.

Electric heating

Metal heating

By arc

323 45, B23K 900

Patent

active

039951375

ABSTRACT:
An AC arc welder which comprises means for detecting the welding current, a comparison circuit for generating logical output signals by comparing the output voltage or output current of the welding current detecting means with the reference voltage or reference current from a reference voltage generating means, digital means for generating logical output signals by performing adding operation or subtracting operation in response to the logical output signal, current supplying means for supplying the output current whose common ratio becoming the geometrical series of approximately m(m = 1, 2, 3 . . . ), and switching means for on and off- controlling the output of the current supplying means in response to the logical output signals of the digital means, thus forming a current feedback loop, whereby the output current from the current supplying means can be changed minutely, thus ensuring stabilized control characteristics.

REFERENCES:
patent: 2529111 (1950-11-01), Steinberger
patent: 3018431 (1962-01-01), Goldstein
patent: 3195038 (1965-07-01), Fry
patent: 3375435 (1968-03-01), Baugher
patent: 3379960 (1968-04-01), May
patent: 3611117 (1971-10-01), Schneider
patent: 3743921 (1973-07-01), Legg et al.

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