PURPOSE: To provide a weld zone of high quality by always carrying out stable oscillation. ;CONSTITUTION: In the narrow gap GMA welding method where plastic deformation is given to a welding wire 1 and an arc is oscillated, welding is performed by using the wire 1 whose cross section is formed into a flat shape 1c or a rectangular shape 1b so that the oscillating direction is always maintained constant for groove side walls. Consequently, weld defects caused by the defective wire oscillation of narrow gap GMA welding can be prevented, the need for work to correct an oscillating plate while watching the arc by a welding operator in the past is eliminated and manpower saving or unmanned operation is made possible.;COPYRIGHT: (C)1993,JPO&Japio
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