| 摘要 |
A plasma torch for locally heating an object, which comprises an anode having an axially extending bore, and 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, the anode and the end section of the cathode defining an annular gap in communication with the chamber and forming a nozzle. The anode and the cathode are connected in an electrically insulating manner, a gas source is connected to the gas connection, a voltage supply is connected to the anode and the cathode, the voltage supply delivering intermittent voltage pulses exceeding the arc-over voltage in the annular gap, and a ring encloses the nozzle and projects axially therefrom to define a front chamber between the nozzle and the object upon which the ring is placed.
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