Method and apparatus for automatic gas control for a plasma arc torch
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United States of America Patent
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Sep 24, 2013
Grant Date -
Jul 17, 2008
app pub date -
Feb 29, 2008
filing date -
Jan 27, 2005
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Abstract
A method and apparatus for controlling a gas supply to a plasma arc torch uses a proportional control solenoid valve positioned adjacent the torch to manipulate the gas flow to the torch, thereby extending electrode life during arc transfer and shutdown. Swirl ring design can be simplified and gas supply and distribution systems become less complicated. The invention also allows manipulation of shield gas flow to reduce divot formation when making interior cuts. The system can be controlled with a digital signal processor utilizing a feedback loop from a sensor.
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