PROBLEM TO BE SOLVED: To solve a conventional problem in which, in simultaneously welding long and numerous places, a distance between an automatic welding truck and a welder or a wire feeder is greatly separated, making cable processing or the like too difficult to perform by a single person.;SOLUTION: On a large-sized portal moving truck, a plurality of welding wires, welders and feeders (5-22 pieces) are installed to constitute a bridge welder, with the entire operation site made movable. In accordance with the transfer of the automatic welding truck, the bridge welder is manually moved, or the distance between the automatic welding truck and the feeder is kept constant by an automatic tracking device, thus, enabling the long automatic welding to be performed.;COPYRIGHT: (C)2005,JPO&NCIPI
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