Multi-electrode submerged arc welding method having excellent weldability

摘要

PROBLEM TO BE SOLVED: To provide a multi-electrode submerged arc welding method excellent in weldability, inhibiting occurrence of a hot crack defect in a weld and having high productivity.;SOLUTION: When welding a thick steel plate 1 at a welding speed v (m/min) with a groove angle set at 2θ(°) and a groove depth set at d (mm), by setting the end portion 52a of the second electrode 52 at an amplitude w1 (mm) expressed with a following formula {(d×1/N×tanθ)/2≤w1 (mm)≤(d×1/N×tanθ)} in the case where the total number N of a plurality of electrodes 5 is 3, and by setting the end portion 52a of the second electrode 52 at the amplitude w1 (mm) and setting the end portion 53a of the third electrode 53 at an amplitude w2 (mm) expressed with a following formula {(d×2/N×tanθ)/2≤w2 (mm)≤(d×2/N×tanθ)} in the case where the total number N of the plurality of electrodes 5 is not smaller than 4, welding is performed while making the electrode or electrodes weave at a frequency f (Hz) expressed with a following formula {0.6≤f (Hz)/v(m/min)} in directions intersecting with a weld line direction.;COPYRIGHT: (C)2012,JPO&INPIT