Arc start method in consumable electrode type arc welding method
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United States of America Patent
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Jun 29, 2010
Grant Date -
Sep 28, 2006
app pub date -
Mar 8, 2006
filing date -
Mar 8, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To provide an arc start method in a consumable electrode type arc welding method capable of firmly executing arc start and capable of executing high quality high speed welding by restraining a welding defect from being brought about therefor, at a portion of a wire projected from a welding tip, a temperature of a front end portion of the wire is made to be at a temperature higher than a temperature of a portion thereof near the welding tip. The front end portion of the wire is preheated to 300° C. or higher, preferably, 450° C. or higher. The front end portion of the wire is preheated by generating arc for preheating. The preheating arc is generated in a spot-like shape at a position near a terminal end portion of a predetermined welding line by constituting a current lower than a welding current.
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