| 摘要 |
PROBLEM TO BE SOLVED: To reduce poor appearance of penetration beads obtained through multi-electrode single-sided submerged arcs.SOLUTION: The welding device 1 performs single-sided submerge arc weldment on a steel sheet with the use of a first welding unit 10 that uses a first wire 110, a second welding unit 20 that uses a second wire 120, a third welding unit 30 that uses a third wire 130 and a fourth welding unit 40 that uses a fourth wire 140. At that time, the first welding unit 10 regulates a feeding speed of the first wire 110 at a constant rate with the use of a first feeding device 11, and supplies electric power to the first wire 110 with the use of a first welding power source 12 whose method of electric power supply is alternating-current and whose external characteristic is set as constant voltage characteristic. |
