Pulsed-DC arc welding

Details Pulsed-DC arc welding Pulsed-DC arc welding

1975-06-02

1977-02-22

Truhe, J. V.

Electric heating

Metal heating

By arc

B23K 910

Patent

active

040093654

ABSTRACT:
An improved technique of pulsed-arc welding is described for applying, to a consumable welding electrode, a DC welding current on which is superimposed a cyclic, high-amplitude pulse component. The pulse-generating circuit includes a capacitor chargeable during the existence of the arc, such capacitor having a normally disabled discharge path including a first thyristor. Such thyristor is energized at a rate of 200-1,000 Hz from a trigger generator, which in turn is energized during the existence of the arc. The discharge pulses from the capacitor are coupled to the welding electrode via a pulse transformer whose secondary winding is isolated from the DC source via a blocking diode. The pulse-generating circuit is so designed that the pulses have a duration in the range of 0.5 .times. 10.sup.-.sup.4 to 5 .times. 10.sup.-.sup.4 sec., a front edge steepness greater than 8 .times. 10.sup.6 amps/sec., and an amplitude selected so that the pulse current density through the welding electrode is greater than 720 amps/mm.

REFERENCES:
patent: 3249735 (1966-05-01), Needham
patent: 3365564 (1968-01-01), Boughton
patent: 3519780 (1970-07-01), Potapievsky et al.
patent: 3528100 (1970-09-01), Budy
patent: 3637974 (1972-01-01), Tajbl et al.

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