Plasma cutting method suitable for cutting thin stainless steel sheet material

摘要

There 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 (m.sup. 3 /sec/m.sup.2), where Q is a rate of flow of the secondary gas and A2 is a pinched area of the secondary gas.