Rotary arc-welding method

摘要

PCT No. PCT/JP81/00357 Sec. 371 Date Jul. 2, 1982 Sec. 102(e) Date Jul. 2, 1982 PCT Filed Nov. 27, 1981 PCT Pub. No. WO82/01839 PCT Pub. Date Jun. 10, 1982.A welding method comprises rotating a nozzle (3) provided with a welding electrode (9) eccentrically from the center axial line (a) thereof within a groove (2). The center axial line (a) of the nozzle is aligned with the center of the groove (2) by smoothing values of variation in welding current or welding voltage for each of the left and right half cycles of the nozzle and controllably moving the nozzle horizontally at right angles to the welding direction so that the difference between these values becomes null. The height of the nozzle (3) relative to the groove (2) is maintained at a prescribed distance by smoothing values of variation in welding current or welding voltage and controllably moving vertically the nozzle (3) so that the difference between the thus smoothed value and a set value becomes null.