To obtain an improved bead shape in which no humping, undercut and underfill are generated when welding is performed for a steel material with a low molten metal viscosity.
In a two-welding wire feeding arc welding method, a first (preceding) welding wire 11 and a second (succeeding) welding wire 12 insulated from each other are supplied from the nozzle 6 at the tip end of a welding torch to weld a steel material with a low molten metal viscosity. In this method, a welding current Iw is energized in the preceding welding wire to generate an arc 3 to form a molten pool 21 while no welding current is energized in the succeeding welding wire. The succeeding welding wire is inserted in a position rising after the molten pool 21 is dug down by the pressure of the arc 3, in the two welding wire feeding arc welding method.
OONAWA TOSHIO
MITA TSUNEO
| JPH0663754A | 1994-03-08 | |||
| JPS5245555A | 1977-04-11 |