F - Mech Eng,Light,Heat,Weapons – 23 – D
Patent
F - Mech Eng,Light,Heat,Weapons
23
D
327/34
F23D 14/44 (2006.01) B23K 9/16 (2006.01) B23K 10/00 (2006.01) B23K 28/00 (2006.01) F23D 14/54 (2006.01) H05H 1/34 (2006.01)
Patent
CA 1261927
ABSTRACT OF THE DISCLOSURE 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.
522923
Couch Richard W. Jr.
Sanders Nicholas A.
Hypertherm Inc.
Riches Mckenzie & Herbert Llp
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