Plasma arc torch with confined and controlled plasma jet column

Electric heating – Metal heating – By arc

Patent

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Details

219 75, 2191215, 21912148, B23K 900

Patent

active

048640972

ABSTRACT:
A plasma arc torch is disclosed as having an elongated hollow body defining a plenum cavity into which an electrode is mounted. The body has a tip end section which is provided with an arc constricting orifice to permit gas injected into the plenum cavity to issue from the arc constricting orifice. Surrounding the arc constricting orifice on an outer surface of the tip end section is an outwardly extending enlarged head portion. Thus, when an arc is established between the tip and electrode in the vicinity of gas passing through the plenum cavity, an arc is formed which is confined and controlled by the outwardly extending enlarged head portion during operation, for example, on a workpiece. In order to start the arc within the center of the electrode, the electrode has a central part thereof in closest proximity to an inner surface of the body adjacent the arc constricting orifice.

REFERENCES:
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patent: 3914573 (1975-10-01), Muehlberger
patent: 4430546 (1984-02-01), Irons et al.
patent: 4455470 (1984-06-01), Klein et al.
patent: 4682005 (1987-07-01), Marhic
patent: 4701590 (1989-10-01), Hutch
patent: 4748312 (1988-05-01), Hutch et al.

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