DC arc welding apparatus using high-frequency pulse current

Details DC arc welding apparatus using high-frequency pulse current DC arc welding apparatus using high-frequency pulse current

1976-03-01

1977-09-06

Truhe, J. V.

Electric heating

Metal heating

By arc

219131R, B23K 910

Patent

active

040469875

ABSTRACT:
A DC arc welding apparatus using a high-frequency pulse current is disclosed and includes a rectifier bridge for commutating AC voltage and for applying DC voltage having a substantially smooth waveform to a circuit including an electrode and a workpiece for welding. A first switch is connected between an arc load formed between the electrode and the workpiece and a positive output side of the rectifier bridge. A second switch is connected between the arc load and a negative output side of the rectifier bridge. A capacitor has one end connected to a contact of the rectifier bridge and the first switch and another end connected to a contact of the rectifier bridge and the second switch. First and second rectifiers are connected so as to charge energy accumulated in the inductance of the circuit including the electrode and the workpiece during the off state of the first and second switches to the capacitor so that the current passed through the arc load is controlled by an on-off control of the first and second switches.

REFERENCES:
patent: 3249735 (1966-05-01), Needham
patent: 3382345 (1968-05-01), Normando
patent: 3459996 (1969-08-01), Adamson
patent: 3588465 (1971-06-01), Anderson et al.
patent: 3775585 (1973-11-01), Okada
patent: 3777176 (1973-12-01), Praeg
patent: 3902037 (1975-08-01), Goto et al.
patent: 3906289 (1975-09-01), Lepp et al.
patent: 3944780 (1976-03-01), Paton et al.

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