| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of producing a high-frequency induction heating tube for a steel tube, a method in which a cooling efficiency of an impeder core is enhanced, while the inner face of a resistance welded tube near the welding point is surely secured in an anhydrous state, in welding by high-frequency induction heating of the abutting ends of a roll-formed steel belt. SOLUTION: The impeder device is one equipped with a center rod 2, an outer cylinder tube 3 surrounding it, and a cylindrical impeder core 4 filled in-between. The welding is performed by high-frequency induction heating while the impeder core is cooled by the cooling water, wherein the cooling water is supplied from an open tube end 6, passed between the center rod 2 and the cylindrical impeder core 4, turned back on the cut end side of the resistance welded tube, and returned to the supply side 7 through the cylindrical impeder core 4 and the outer cylinder tube 3. COPYRIGHT: (C)2007,JPO&INPIT
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