Electric heating – Metal heating – By arc
Patent
1987-06-02
1989-03-28
Paschall, M. H.
Electric heating
Metal heating
By arc
21912151, 21912148, 219 75, 21912139, B23K 900
Patent
active
048166375
ABSTRACT:
A plasma arc cutting torch and method for obtaining more efficient cuts underwater, and for muffling the noise and radiation of a plasma cutting torch when used above water, surrounds the plasma arc with high-pressure, high-velocity annular flows of air and water. In one embodiment, a radially inward air flow creates a high-pressure, water-free cutting zone around the plasma while a surrounding radially outward water flow cooperates with and stabilizes the air flow. The water-free cutting zone created during underwater cutting, or above-water cutting on a water-table, includes the cut itself and the underside of the workpiece in the vicinity of the plasma. The air flow prevents water from interfering with the progress of the cut and hydrogen gas from accumulating under the workpiece.
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Couch, Jr. Richard W.
Sanders Nicholas A.
Hypertherm, Inc.
Paschall M. H.
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