To provide a plasma torch in which a nozzle can be effectively cooled to an ejecting hole of plasm arc and which has a stable electrification properties
[Measures to solve the problem]
The plasma torch of the present invention has nozzle A and the torch body B. The nozzle A has the inner nozzle 2 and the inner cap 3 which is fastened to the torch body with the inner nozzle 2. The annular water passage 8 and a plurality of independent water passages 9 are formed between the inner nozzle 2 and the inner cap 3. A fastening force applied when the inner cap 3 is fastened to the nozzle base 14 is transmitted via the partitions 2f. The torch body B has the water supply port 20 and the water drain port 21. At least one of the water supply port 20 and the water drain port 21 is configured as a groove which extends on a plane which crosses the axis and which is connected to the water passage. When the nozzle A is fastened to the torch body B, one of the independent water passages communicates with the water supply port and another one of the independent water passages communicates with the water drain port. Further, the rear end surface 2h of the inner nozzle is in contact with the end surface 14a of the nozzle base 14 thereby obtaining electrical conductivity.
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