| 摘要 |
PROBLEM TO BE SOLVED: To enable the formation of an excellent welding bead unaccompanied by such a failure as an undercut or a humping bead at high speed and in particular, to give an allowance for the existence of a gap even when a certain gap is formed at a welding of a thin plate material, a thin pipe material, or the like. SOLUTION: An arc welding equipment 1 of a two-piece construction, where a power feeding tip 4 which forms a welding wire through-hole 4H and an insulation tip 5 which forms the same welding wire through-hole 5H are connected, is used. An arc welding is executed under the condition that an effective wire extension E (mm) from the tip of a power feeding tip 4 is given by the relation 16×d (mm)<=E<=40<=d (mm), where d (mm) stands for the diameter of a welding wire 3, and a gap G is formed by satisfying the relation 0.5×t (mm)<=G<=1.5×t (mm), where t (mm) stands for the plate thickness or the thickness of a welded base material 7 and G (mm) stands for the joint space (gap).
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