B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 9/29 (2006.01) B23K 9/013 (2006.01) B23K 10/00 (2006.01) H05H 1/34 (2006.01) H05H 1/28 (2006.01)
Patent
CA 2065025
A plasma arc cutting torch 10, particularly one operating in the 0-200 ampere range, has a shield 38 mounted at its lower end adjacent a workpiece 26 to block splattered molten metal 26a from reaching a nozzle 16 of the torch. The shield 38 is electrically insulated, preferably by mounting it on an insulating ring 22 that is itself secured on a cap 20 screwed onto the torch body 12. A secondary gas flow 48 through the torch passes through the space 40 between the nozzle 16 and the shield 38 to provide cooling. Bleed ports 44,44' 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 42 in the shield, to stabilize the plasma arc. The bleed ports 44,44' are outwardly angled away from the arc. Canted ports in the secondary gas flow path, but before the bleed ports, produce a swirling of the gas flow which enhances the quality of the cut. A flow control system 60, preferably one utilizing parallel branch conduits and control valves, allows the selection of flow rates for the secondary gas depending on the cutting conditions.
Couch Richard W. Jr.
Sanders Nicholas A.
Hypertherm Inc.
Riches Mckenzie & Herbert Llp
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