The sub merging arc welding process of the steel which features

摘要

PROBLEM TO BE SOLVED: To provide a multi-electrode submerged arc welding method of steel materials which is suitable for pipe-making welding of large diameter steel pipes such as UOE steel pipes and spiral steel pipes.;SOLUTION: In the submerged arc welding of steel materials for performing a both side one layer welding with three or more electrodes, the current density of a first electrode satisfies the expression (1), the current density of the rearmost electrode satisfies the expression (2), and the current of the first electrode and of the rearmost electrode satisfy the expression (3): (1) D_L≥220 ; (2) 80≤D_T≤120; and (3) I_T/I_L≥0.50; where D_L is the current density (A/mm²) of the first electrode; D_T is the current density (A/mm²) of the rearmost electrode; I_L is the current (A) of the first electrode; and I_T is the current (A) of the rearmost electrode, wherein the current density is a value for which a welding current is divided by the cross-section area of a welding wire.;COPYRIGHT: (C)2010,JPO&INPIT