| 摘要 |
PURPOSE:To obtain a long tube excellent in airtightness and more than 10,000m in length in a process that makes a long tube by TIG welding seam parts made by forming a metallic tape to cylindrical form continuously, by pushing down the electrode of a welding torch according to consumption. CONSTITUTION:A metallic tube 3 made by rounding a relatively thin metallic tape having incorporated wire 1 such as an optical fiber cable etc. is moved in the direction shown by the arrow, and the seam part 2 is welded continuously by the body 5' of a fixed arc torch for TIG welding. A collet 7' is previded in a collet body 8 provided with a gas passaged inside of the body 5', and a W group electrode 4 is provided in the collet with its tip projected from a nozzle 6. An electrode pushing rod 22 is brought into contact with the rear end of the electrode 4 and the rear end is fitted to an electrode thrusting tool 23 screwed to inside of torch cap 14 provided at rear end. When welding, the distance G between the seam part 2 and the tip of the nozzle 6 is kept constant by screwing in the thrusting tool 23 according to consumption of the electrode 4, and at the same time, the distance g between the seam part 2 and electrode 4 is also nearly constant.
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