Patent ID: 8546719
Filing Date: 2013-10-01
Classification: B23K,H05H

Abstract:
1. A method of operating a plasma arc torch to selectively cut, as well as form markings on surfaces of, metal workpieces without having to change any consumables of the torch, the method comprising the steps of: (1) providing a plasma arc torch comprising (2) marking the workpiece by delivering a plasma marking gas to the plasma gas passage and thus to the plasma cavity, delivering liquid to the liquid injection passage and thus to the annular liquid chamber, and delivering electrical power to the electrode at a relatively low power level that is suitable for plasma marking of the workpiece, such that a relatively low-current arc is directed, along with a stream of plasma marking gas and the liquid, out from the axial liquid injection orifice toward the workpiece; and (3) cutting the workpiece, or another workpiece, by delivering a plasma cutting gas to the plasma gas passage and thus to the plasma cavity, delivering liquid to the liquid injection passage and thus to the annular liquid chamber, and delivering electrical power to the electrode at a relatively high power level that is suitable for plasma cutting of the workpiece, such that a relatively high-current arc is directed, along with a stream of plasma cutting gas and the liquid, out from the axial liquid injection orifice toward the workpiece.