ELECTROSLAG WELDING METHOD AND ELECTROSLAG WELDING APPARATUS

摘要

In electroslag welding using a slide type backing plate, welding is carried out while maintaining the depth of the slag bath at a predetermined depth, thereby ensuring sound penetration and preventing the deterioration of the mechanical properties of the weld metal. The electroslag welding apparatus 100 includes a welding torch 4 having a contact tip 5 that feeds a welding wire 6, a sliding type copper backing plate 2, a welding torch 4, A running truck 16 having a backing plate 2, a molten slag bath detector 13, a flux supply device 14, a flux supply control device 15 and a traveling car control device 17 do. The flux supply control device 15 controls the supply of flux so that the length Ld of the welding wire 6 from the tip of the contact tip 5 to the molten slag bath 7 becomes a predetermined length. The traveling balancing control device 17 controls the traveling speed of the traveling bogie 16 so that a predetermined relationship between the reference current value and the welding current 8 is satisfied. The welding is performed while maintaining the slag bath depth Ls at a predetermined depth.