VERTICAL NARROW-GROOVE GAS SHIELDED ARC WELDING METHOD

摘要

In a vertical narrow-groove gas shielded arc welding method by which two thick steel materials (1) having a plate thickness of not less than 10 mm as a predetermined groove condition are joined by single layer welding or multilayer welding using weaving, weaving for initial layer welding is performed using a welding torch (4) having a bent portion and a tip portion defined by the bent portion, wherein, at the time of weaving with respect to groove surfaces (2) of the thick steel materials, the tip portion of the welding torch is swung toward the groove surfaces of the thick steel materials under a predetermined condition.