作動ガスにエアを用いたプラズマガウジング法の諸特性に関する研究

概要

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Currently, plasma gouging machines supplied by domestic equipment manufacturers are classified according to orifice gases used in them; some use mixtures of 30% hydrogen and argon, whereas some use only nitrogen. Stainless steel and aluminum alloy, which were previously used in arc welding, are used with a carbon steel for plasma gouging, thus resulting in high efficiency and high quality gouging. The plasma gouging process using only nitrogen allows carbon steel to be processed with a single gas, which is a potential selling point. However, plasma gouging or cutting using a mixture of gases is more expensive owing to the consumption of the two orifice gases. In order to use hydrogen, which is a combustible gas, special safety control is necessary in the storage of hydrogen gas cylinders. Compressed air can be easily used as an orifice gas; therefore, the author investigated various properties of the plasma gouging method using compressed air.