| 摘要 |
PURPOSE:To increase the efficiency of a blocking work remarkably, by using an annular filler metal which fully fits to the joint aperture, especially when an aperture between a pipe, which is installed in a reaction tank, and a through- hole is blocked, in a heat exchanger of multi-pipe type. CONSTITUTION:In order to block a necessary number of through-holes 7 with a filler metal 11 being bored through a pipe plate 6, and a joint aperture 11 on the inner side surface of the pipe plate, a pipe 5 thereof being inserted through the hole 7, as annular beveling part 8 is formed previously. On said beveling part 8, a filler metal 10 is fixed in the manner that the whole or a part of said filler metal is burried throughout the front and the rear part of the pipe 5 insertion portion. Then, the pipe plate 6 is heated from its upper or lower surface, fusing the filler metal 10, and the joint aperture 11 at the inner surface of the tube plate 6 between the pipe 5 and the through-hole 7 is blocked, thereby preventing the corrosion of the aperture at the pipe end part. |
