| 摘要 |
PURPOSE:To increase the quality of a bead by varying the feeding speed of two pieces of welding wires on each a fixed period and by providing a phase difference in the period of the wire feeding speed as well. CONSTITUTION:A driver 6A, 6B is respectively provided for the right and left wire feeding motor 5A, 5B, further a phase shifter 8 is arranged on one part of driver 6B. A nozzle 2A, 2B is moved along the groove and welding wire 3A, 3B is causing an arc in the space with the material 1 to be welded. In this case, the feeding speed of the wire 3A, 3B is made to vary according to a sine waveform, etc. and is varied by providing the phase difference at 180 deg., etc. via the phase shifter 8 further. With this method, on the welding currents of the welding wire 3A, 3B the other part can be made minimum in case of the one part being maximum. Consequently the turbulence of the arc based on the electromagnetic force of the welding current is reduced and the bead quality is increased. |
