GAS SHIELD ARC WELDING METHOD

摘要

PURPOSE:To enable a one layer one bead welding with the conventional groove width by combining a parallel oscillator and peudulum oscillator in case of a gas shielding arc welding. CONSTITUTION:A torch 3 is first put into the center of the inside of the groove 1 of a thick plate to perform an arc starting in succession to the previous layer bead 2 and an arc 6 is generated from a wire 4. A side wall 1a is then melted sufficiently by resting the torch 3 for the prescribed time at the left end with pendulum oscillation by the oscillating angle theta centering around the pendulum center point 7 after approaching the torch 3 to the groove side wall 1a with the parallel oscillation of the torch 3 by W/2, for instance, in the left direction. The oscillation of the torch 3 is then returned and the torch 3 is moved by W/2 with the parallel oscillation with standing the torch 3 vertically and is returned to the center of the groove 1. The similar operation is performed in the right direction of the groove as well and the oscillation is repeated until the completion of the welding with making one cycle of an oscillation by setting the movements in the right and left directions.