Abstract: The plasma torch has a nozzle and body. The nozzle has an inner nozzle and inner cap fastened to the body with the inner nozzle. Annular water passage and a plurality of independent water passages are formed between the inner nozzle and inner cap. Force applied when the inner cap is fastened to the nozzle base is transmitted via partitions. The torch body has a water supply port and drain port. At least one of the water supply port and drain port is configured as a groove extending on a plane crossing the axis and is connected to the water passage. When the nozzle is fastened to the torch body, one of the independent water passages communicates with the water supply port and another communicates with the water drain port. Rear end surface of inner nozzle is in contact with end surface of the nozzle base thereby obtaining electrical conductivity.

Abstract: The present invention is a plasma cutting apparatus (A) configured such that a starting gas is switched to plasma gas at the stage when current is applied to an electrode provided to a plasma torch, and a plasma arc is produced at a preset current value on a material (B) to be cut, so as to extend the life of the electrode, wherein the apparatus is configured to have: a starting gas supply unit (2) having a starting gas solenoid valve (2b) provided with a starting gas supply source (2a) and a starting gas pipeline (2c); a plasma gas supply unit (3) having a plasma gas solenoid valve (3b) provided with a plasma gas supply source (3a) and a plasma gas pipeline (3c); a plasma gas connection part (8) for connecting the downstream-side end part of the starting gas supply unit and the downstream-side end part of the plasma gas supply unit; a gas pipeline part (5) for connecting the plasma gas connection part (8) and a torch body (1a); a flow retention member (4) provided to the gas pipeline part; and a control devi

Abstract: The present invention is a plasma cutting apparatus (A) configured such that a starting gas is switched to plasma gas at the stage when current is applied to an electrode provided to a plasma torch, and a plasma arc is produced at a preset current value on a material (B) to be cut, so as to extend the life of the electrode, wherein the apparatus is configured to have: a starting gas supply unit (2) having a starting gas solenoid valve (2b) provided with a starting gas supply source (2a) and a starting gas pipeline (2c); a plasma gas supply unit (3) having a plasma gas solenoid valve (3b) provided with a plasma gas supply source (3a) and a plasma gas pipeline (3c); a plasma gas connection part (8) for connecting the downstream-side end part of the starting gas supply unit and the downstream-side end part of the plasma gas supply unit; a gas pipeline part (5) for connecting the plasma gas connection part (8) and a torch body (1a); a flow retention member (4) provided to the gas pipeline part; and a control devi

Abstract: [A problem to be solved] 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.