Plasma Cutting Machine
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United States of America Patent
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app pub date -
Jun 2, 2005
filing date -
Jul 5, 2004
priority date (Note) -
Abandoned
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Abstract
A plasma cutting machine cuts stainless steel with good quality. An inactive gas (nitrogen) is supplied as a plasma gas, and a combustible gas (propane) having a specific gravity higher than that of air and having a reducing ability or a mixed gas of the combustible gas (propane) and an inactive gas (nitrogen) is supplied as an assist gas to a plasma torch. The combustible gas (propane) contained in the assist gas is not supplied in the pre-flow interval and after-flow interval, and is supplied only in the plasma arc generation interval.
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