| 摘要 |
PURPOSE:To obtain a metallic pipe contg. a wire-like body without producing defective products by inserting a heat shielding body between the seam part of a metallic tape and the wire-like body in the inside and welding the seam part with a torch. CONSTITUTION:An arc-shaped heat resistant shielding body 16 made of chrome plated steel or ethylene tetrachloride resin or the like is inserted to the inside surface of a metallic pipe in the final stage of a forming unit for the metallic pipe, that is, in the position of a forming die 13 and the position for welding with a torch 7 in succession to said die, hence between a wire rod 1 in the inside and the seam part 15 of the metallic pipe. Thereafter, the seam part 15 is welded with the torch 7. By the above-mentioned method, the pipe is molded and welded continuously without any thermal influence upon the internal body 1. |
