Patent ID: 8362387
Filing Date: 2013-01-29
Classification: B23K

Abstract:
1. A non-contact initiation plasma arc torch comprising: a nozzle having a proximal end defining an inlet, a distal end defining an outlet, and a passageway extending from the inlet to the outlet, the passageway including a tapered section with a diameter decreasing in the direction of the outlet; and an electrode extending into the passageway, the electrode having a unitary body including a distal end opposing the outlet of the nozzle, the electrode having a tapered section terminating at the distal end configured so that the electrode diameter decreases in the direction of the distal end, the electrode tapered section including at least one discontinuity forming an edge opposing the nozzle tapered section, the edge being disposed so as to have an included angle of no greater than about 90 degrees, the configuration of the edge of the electrode providing a localized enhancement of electrical field during non-contact initiation of a pilot arc.