B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/72
B23K 7/00 (2006.01) H05H 1/28 (2006.01) H05H 1/34 (2006.01)
Patent
CA 1242001
ABSTRACT Disclosed is a plasma arc torch adapted to operate in the nontransfer arc mode and which is characterized by long electrode life, and comprising a torch housing with a rear electrode mounted within the housing and comprising a tubular metal member having a closed inner end and an open outer end. A front electrode comprises a tubular metal member having a bore therethrough, the front electrode being mounted within the housing and in coaxial alignment with the rear electrode and having an inner end adjacent the open outer end of the rear electrode and an opposite outer end. Vortex generating means is provided for generating a vortical flow of a gas at a location intermediate the rear and front electrodes and which is in coaxial alignment with the rear and front electrodes. A power supply means is operatively connected to the rear and front electrodes for generating an arc which is adapted to extend axially from the rear electrode through the vortical flow of gas and to an attachment point located on the front electrode. The improvement pertains to the bore of the front electrode including an outer end portion which is cup-shaped in cross section to define an outwardly facing radial shoulder, and wherein the power supply means includes a direct current source with the anode thereof connected to the rear electrode and the cathode thereof connected to the front electrode. Means is provided for coordinating the vortex generating means and the power supply means such that the arc attaches on the radial shoulder of the front electrode, and whereby the attachment of the arc to the radial shoulder results in erosion of the material of the front electrode along an axial path of travel rather than radially through the electrode, to thereby extend the life of the front electrode.
494365
Camacho David P.
Camacho Salvador L.
Meredith & Finlayson
Plasma Energy Corporation
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