Plasmaschneideverfahren

摘要

PCT No. PCT/JP94/01731 Sec. 371 Date Mar. 18, 1996 Sec. 102(e) Date Mar. 18, 1996 PCT Filed Oct. 14, 1994 PCT Pub. No. WO95/10385 PCT Pub. Date Apr. 20, 1995There is provided a plasma cutting method using a plasma cutting apparatus which comprises a plasma torch including: an electrode; a confining nozzle so arranged as to surround the electrode with a spacing therefrom that defines a passage for flushing a plasma gas; and an assisting nozzle so arranged as to surround the confining nozzle with a spacing therefrom that defines a passage for flushing a secondary gas, characterized in that a rate of flow of the secondary gas per unit area Vq which is expressed by an equation: Vq=Q/A2 is not less than 250 (m3/sec/m2), where Q is a rate of flow of the secondary gas and A2 is a pinched area of the secondary gas.