Arc start method in consumable electrode type arc welding...

Details Arc start method in consumable electrode type arc welding... Arc start method in consumable electrode type arc welding...

2006-03-08

2010-06-29

Ralis, Stephen J (Department: 3742)

Electric heating

Metal heating

By arc

C219S137710

Reexamination Certificate

active

07745758

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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