Patent ID: 6215088
Filing Date: 2001-04-10
Classification: B01D,B23K

Abstract:
A plasma torch for locally heating an object, which comprises(a) an anode having an axially extending bore,(b) a cathode having an end section extending coaxially through the bore in the anode and another section passing through a chamber communicating with a gas connection,(1) the anode and the end section of the cathode defining an annular gap in communication with the chamber and forming a nozzle,(c) means for connecting the anode and the cathode in an electrically insulating manner,(d) a gas source connected to the gas connection,(e) a voltage supply connected to the anode and the cathode, the voltage supply delivering intermittent voltage pulses exceeding the arc-over voltage in the annular gap for generating plasma pulses, and(f) a ring enclosing the nozzle and projecting axially therefrom to define a front chamber between the nozzle and the object upon which the ring is placed.