Method for orbital welding using a pulsed current
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United States of America Patent
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Feb 26, 2008
Grant Date -
Sep 28, 2006
app pub date -
Mar 24, 2006
filing date -
Mar 25, 2005
priority date (Note) -
Expired
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Abstract
A method for the orbital welding of tubular elements held in abutment comprising the steps of striking an arc at a strike point with an orbital welder between an electrode and a seam formed by a first tubular element and a second tubular element, held in abutment within a fixture; initiating an orbit of said electrode around an abutment of said first tubular element and said second tubular element; adjusting the current of said arc in a pulsed manner from a maximum current to a minimum current at a set frequency, combination of said maximum current and said minimum current forming an average current; decreasing said average current in a generally continuous manner as said orbit of said electrode progresses from said strike point, the rate of decrease of said maximum current having a generally inverse relationship to the rate of increase in temperature experienced by said tubular elements.
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