Plasma arc torch interlock with disabling control arrangement sy

Details Plasma arc torch interlock with disabling control arrangement sy Plasma arc torch interlock with disabling control arrangement sy

1988-12-05

1990-05-29

Paschall, M. H.

Electric heating

Metal heating

By arc

21912157, 2191304, 21913032, B23K 900

Patent

active

049298119

ABSTRACT:
A plasma arc torch system includes a fault detect circuit for sensing a short between the electrode and the nozzle and disabling the power supply when the short is sensed. A sensing circuit within the torch cable is provided for actuating the fault detect circuit when the cable is severely punctured. The sensing circuit includes a foil embedded within the cable which circumscribes the main conductor to which a drain lead is connected. The drain lead senses a short between the foil and main conductor from a penetrating foreign object and actuates the fault detect circuit. Additionally, the fault detect circuit is effective in combination with a unique continuity interlock circuit disclosed to insure a safe torch. Further, a rectified control circuit is provided to maintain a stable arc preventing erosion of the nozzle and subsequent exposure of the electrode.

REFERENCES:
patent: 3745321 (1973-07-01), Shapiro et al.
patent: 4049946 (1977-09-01), Fluckiger et al.
patent: 4272671 (1981-06-01), Hukagawa et al.
patent: 4330700 (1982-05-01), Jagieniak et al.
patent: 4585921 (1986-04-01), Wilking et al.
patent: 4590354 (1986-05-01), Marhic et al.
patent: 4663515 (1987-05-01), Kneeland et al.
patent: 4682005 (1987-07-01), Marhic
patent: 4814577 (1989-03-01), Dallavalle et al.

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