Control circuit in plasma arc cutting and welding equipment desi

Details Control circuit in plasma arc cutting and welding equipment desi Control circuit in plasma arc cutting and welding equipment desi

1987-02-24

1989-03-21

Paschall, M. H.

Electric heating

Metal heating

By arc

21912154, 2191215, 21912139, 2191304, B23K 900

Patent

active

048145777

ABSTRACT:
The circuit comprises a transformer and a rectifier, and is used in conjunction with a torch the electrode of which is wired to one of the output terminals of the rectifier; the nozzle is connected to the remaining terminal by way of a resistor. A comparator monitors passage of the power stage from stand-by to normal non-transferred arc operation, and triggers switch-in of the ground cable by way of which the work is connected to the relative terminal of the rectifier, only after an arc has first been struck between the electrode and the nozzle.

REFERENCES:
patent: 3344256 (1967-09-01), Anderson
patent: 3775392 (1968-03-01), Brzozowski et al.
patent: 3809850 (1974-05-01), Saenger, Jr.
patent: 3832513 (1974-08-01), Klasson
patent: 3858072 (1974-12-01), Dembovsky
patent: 3997756 (1976-12-01), Bykhovsky et al.
patent: 4125754 (1978-11-01), Wasserman et al.
patent: 4481636 (1984-11-01), Curr et al.
patent: 4678888 (1987-07-01), Camacho et al.

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