Manufacturing method of vertical narrow groove welded joint and vertical narrow groove welded joint

摘要

Provided is a method for manufacturing an vertical narrow groove welded joint having excellent weld toughness using a thick-walled high-strength steel material. When two steel materials are butted through a narrow groove with a groove angle of 20 ° or less and joined by vertical gas shielded arc welding using weaving, the vertical welding in the vertical gas shielded arc welding The ascending speed v (mm / min) and the inverse number f (s-1) of the time (s) required for one cycle of the weaving are adjusted within a range satisfying v / 60 / f ≦ 9.0.