| 摘要 |
PROBLEM TO BE SOLVED: To provide a plate connection welding method by which steel plates are butted against each other and the butt part of the steel plates is subjected to submerge welding only from either side to perform plate connection such as the case of coil connection welding, e.g., used in the production of a spiral steel pipe, and by which a weld bead can be formed to the rear side of each steel plate, and repair welding on the rear side is therefore made unnecessary, e.g., after the formation of the steel pipe. SOLUTION: In a state where steel plates 1, 1 are butted and a backing strip 4 is abutted against the rear face on the side opposite from a welding torch 3 in the butt part 2 of the steel plates 1, 1, a coil 5 for high frequency induction heating is arranged ahead in the progressing direction of the welding torch 3, and while heating is performed beforehand so that the temperature of the butt part 2 reaches the prescribed temperature, submerge arc welding is performed and the plates are connected. COPYRIGHT: (C)2006,JPO&NCIPI |
