Koike Sanso Kogyo Co., Ltd.

Voike Sanso Kogyo Co., Ltd.

Masatoshi Motoyama

Akira Furujo

Tetsuo Koike

Ryuta Hirai

Kazuya Kashimata

Tetsuya Iizuka

Nobuo Ito

Akira Hurujo

Ryosuke Kimoto

Susumu Kanda

Katsuhiko Sakamoto

Daiji Sakai

Go Sasaki

Takayuki Takarada

Kayoko Morishita

Yasuyuki Takarada

Kazuomi Kusumoto

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.

Plasma torch

Outer nozzle for plasma torch

[PROBLEMS] To reduce the generation of fume in cutting a material to be cut typified by a steel plate with plasma. [MEANS FOR SOLVING PROBLEMS] A plasma cutting method comprising spraying a plasma arc directed through a material to be cut from a plasma torch nozzle to cut the cutting material, wherein a plasma arc formed by supplying a mixed gas as a plasma gas composed of a single gas or a plurality of gases selected from halogen gases and rare gases belonging to up to the second row elements of the periodic table and a hydrogen gas, and oxygen-, argon- or nitrogen-containing gas to a part around an electrode, and electrifying a part between the electrode and the nozzle or between the electrode and the cutting material is sprayed toward the cutting material to cut the cutting material, or wherein a single gas or a plurality of gases selected from halogen gases or rare gases belonging to up to the second row elements of the periodic table and a hydrogen gas, together with the plasma arc composed mainly of an oxygen, argon or nitrogen gas, is sprayed toward the cutting material to cut the cutting material.

Plasma cutting method for cutting a carbon steel plate and for reducing fine particles

Electrode for plasma torch

Inner nozzle for plasma torch

Plasma torch body

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Tokyo, Japan

Masatoshi Motoyama