Method and apparatus for controlling AC pulse arc welding and welding power source apparatus
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United States of America Patent
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Jul 29, 2003
Grant Date -
Mar 14, 2002
app pub date -
Sep 12, 2001
filing date -
Sep 12, 2000
priority date (Note) -
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Abstract
In a method and an apparatus for controlling AC pulse arc welding executed by supplying a welding current flowing between a welding wire and an object to be welded with feeding the welding wire at a feeding speed corresponding to a predetermined feeding speed setting signal, a one-period process for supplying the welding current is repeatedly executed. The one-period process includes a first process during a peak time interval, a second process during a negative electrode time interval, and a third process during a base time interval. The one-period process further includes a fourth process during a switching current interval, inserted between the peak time interval and the negative electrode time interval, for supplying a welding current having a switching current for stopping growth of droplet which is smaller than a threshold current with a positive electrode polarity.
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