| 摘要 |
PROBLEM TO BE SOLVED: To provide a welding starting method for two wire welding which can smoothly start two wire welding, and further, can prevent the generation of a welding defect at the starting edge of a weld bead. SOLUTION: Disclosed is a welding starting method for two wire welding where, while generating an arc 2 from a wire WA, it is progressed to a welding direction, and further, a filler wire WB is fed from the rear part in the welding direction. The method includes: a step where the filler wire WB is made to approach toward a welding base material P while being where detection voltage Vt is applied; a step where the approach of the filler wire WB is stopped after the flowing of a detection current It; a step where the filler wire WB is separated from the welding base material P; a step where the ignition of the arc 2 and the progression of the wire WA and the filler wire WB to the welding direction are started; and a step where the filler wire WB is fed toward the welding base material P. By such constitution, the breakage of the filler wire WB and a welding defect at the starting edge of a weld bead Wp can be prevented. COPYRIGHT: (C)2009,JPO&INPIT
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