UNDERWATER MARKING WITH A PLASMA ARC TORCH
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United States of America Patent
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Issued Date -
Mar 17, 2011
app pub date -
Sep 14, 2010
filing date -
Sep 14, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of marking underwater with a plasma arc torch is provided. The method includes surrounding a plasma arc produced by the plasma arc torch with a flow of gas. The flow of gas may be directed around and/or along the body of the plasma arc torch with an air curtain attachment. Directing the flow of gas in this manner generates a protective air curtain which substantially surrounds the plasma arc. A current between 8 and 35 amperes may be used to mark the workpiece. Thereafter, the workpiece may be cut using the same plasma arc torch with a current between 30 and 750 amperes. The same nozzle and rate of flow of gas may be used for both the marking and cutting operations. Additionally, the workpiece may be kept underwater throughout the marking and cutting operations.
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