Nozzle shield for a plasma arc torch

Details Nozzle shield for a plasma arc torch Nozzle shield for a plasma arc torch

1988-06-07

1989-08-29

Paschall, M. H.

Electric heating

Metal heating

By arc

219 75, 21912151, 21912152, B23K 900

Patent

active

048619620

ABSTRACT:
A plasma arc cutting torch, particularly one operating in the 0-200 ampere range, has a shield mounted at its lower end adjacent a workpiece to block splattered molten metal from reaching a nozzle of the torch. The shield is electrically insulated, preferably by mounting it on an insulating ring that is itself secured on a cap screwed onto the torch body. A secondary gas flow through the torch passes through the space between the nozzle and the shield to provide cooling. Bleed ports in the shield allow an enhanced flow rate with the remaining flow being at a rate, in conjunction with the size of an exit orifice in the shield, to stabilize the plasma arc. Canted ports in the secondary gas flow path produce a swirling of the gas flow which enhances the quality of the cut.

REFERENCES:
patent: 3272962 (1966-09-01), Mauskapf
patent: 3641308 (1972-02-01), Couch, Jr. et al.
patent: 4389559 (1983-06-01), Rotolico et al.
patent: 4421970 (1983-12-01), Couch, Jr.
patent: 4521666 (1985-06-01), Severance, Jr. et al.
patent: 4762977 (1988-08-01), Browning

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