| 摘要 |
PURPOSE: To improve the strength of a connection area by inserting end of a gas tube into a perforation of a flange and welding to fix them together, and forming the ends of the perforation and the gas tube having the same but opposite angle shaped in taper. CONSTITUTION: While connecting a flange 6 to a gas tube 1, an expansion par 3 is formed near the end of the gas tube 1, an end part 4 of the gas tube 1 starting from the expansion 3 is formed in taper shape that is reduced in diameter. On the other hand, a perforation 5 for receiving the gas tube having the same taper area 9 with the same but opposite tapering angle as the end part 4 of the exhaust gas tube 1 is formed in a flange 6. And, the end 4 of the gas tube 1 is inserted into the taper area 9 of the perforation 5, and the end face of the gas tube 1 is fixed on the inner surface 7 of the perforation 5 by a welding seam. |
