| 摘要 |
PURPOSE:To stably form a bead having a good shape by following a variation of width of a groove, by controlling the rocking width of an electrode so that a difference of welding currents in case when a welding electrode is positioned in the center part of the groove and both the end parts becomes equal to a reference value. CONSTITUTION:In a method for arc-welding materials to be welded 3, 4 by rocking an electrode 1 installed to a welding torch 6, in the width direction of groove 2, moving it in the weld line direction and making a welding current flow from a welding power source 7, a Y axis motor 17 and an X axis motor 19 are controlled in accordance with a welding current detecting signal by a welding current detector 22, a distance between the electrode 1 and the materials to be welded 3, 4 is held in a set reference value, and the center of rocking of a torch shaft 10 is held in the center in the groove width direction. Also, the rocking width is controlled through a motor 13 of a rocking block 12 so that a difference of detecting signals of welding currents in the rocking center part and the end part becomes equal to a set reference value. Said method can be executed by detecting the welding voltage, as well. |
