Multi-pass welding method and multi-pass automatic welding equipment

摘要

PROBLEM TO BE SOLVED: To provide a multi-layer welding method and multi-layer automatic welding equipment for obtaining excellent welding of full penetration without hot cracks suitable for a welded structure of a double-V groove joint of poor dimensional accuracy such as gap changes and meandering of the weld line.;SOLUTION: The groove of the double-V groove joint of a thick and long member is limited to a range of 30-40° narrower than a conventional groove. The pulse welding pattern to transfer one droplet by one pulse of a high current, a plurality of average currents and other average currents on a filled layer and a finished layer by the gap width range to be output in the root running are set. In the root running, the average current and the average voltage corresponding to the gap width are output in a stepped manner in a controlled manner based on the detection information on the positional deviation in the right-to- left direction and the vertical direction of the gap width and the groove center of the groove part. The deposition area, the welding speed, and the weaving width, and the condition parameters such as the frequency are calculated, and the positional deviation of the torch in the right-to-left direction and the vertical direction of the weld line is corrected.;COPYRIGHT: (C)2004,JPO