Welded tube manufacturing apparatus and welded tube internal surface bead cutting apparatus

Abstract

This apparatus manufactures a welded tube by curling a metal strip T into a tube shape, heating the two edges thereof using an induction heating coil 6, and pressure welding the two edges using squeeze rolls 8. A ferrite core 21 for increasing heating efficiency that has a substantially circular arc shaped cross section is provided at a position on the top surface portion 25 of an impeder body 24 directly below the induction heating coil 6. A protective layer 29 formed from fluororesin is provided on the top surface of the impeder body and this protective layer catches spatter “c” generated during welding. The distal end of a cooling water supply tube 27 is embedded in a concave groove 26 in the impeder body 24 and the ferrite core 21 is cooled via a through passage 21a formed between the ferrite core 21 and a flat surface portion.

Dependencies are inferred from the claim text.