| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-electrode submerged arc welding method capable of controlling a bead width without considerably changing welding conditions and electrode arrangement, of increasing the bead width to prevent surface defects, such as undercut, and of forming beads in an excellent shape evenly on both sides of the weld line.SOLUTION: An N-th electrode arranged at the backmost part in the welding progress direction and an (N-1)th electrode arranged immediately before the N-th electrode are arranged on both the left side and the right side of the weld line; a distance between a wire tip end position and the weld line on the steel sheet surface of the N-th electrode and a distance between the wire tip end position and the weld line on the steel sheet surface of the (N-1)th electrode are both set within a range between 5 and 15 mm, and an electrode-to-electrode distance in the welding progress direction of the N-th electrode and the (N-1)th electrode is set within a range between 0 and 20 mm; and at the same time, a phase difference &thetas;between an (N-2)th electrode arranged immediately before the (N-1)th electrode and the (N-1)th electrode, a phase difference &thetas;between the (N-1)th electrode and the N-th electrode, and a phase difference &thetas;between the (N-2)th electrode and the N-th electrode are all set within a range between 60 and 300°. |
