| 摘要 |
PURPOSE:To join a tube plat and a heat exchanger tube in a short time by a joint part of a high accuracy which is free from a welding defect by fixing the tube plate attached by a butt groove of I type and the heat exchanger tube by a groove aligning device, welding by pressure the groove part, and executing its diffusion joining. CONSTITUTION:A tube plate 3 and a heat exchanger tube 4 on which a butt groove of I type has been formed, respectively are groove-aligned, a mandrel type a groove aligning device 20 is inserted from a tube hole, a roller 22 is expanded by rotating shaft 21, and both of them are brought to a surface hit by a groove part and fixed. Subsequently, a blank cap 26 is set to a tube hole of the opposite side of the heat exchanger tube 4, and the inside of the tube is made to form a vacuum through a vacuum forming hole 23 of the shape 21 in order that an oxidation of the joint part is prevented and a mixing of impurities is prevented. Next, the tube plate 3 and the heat exchanger tube 4 are brought to a diffusion joining by pressing the heat exchanger tube 4 against the tube plate 3 by a pressure device 28 consisting of a cylinder 29 and a brace 30, and attaching a diffusion joining device (omitted in the figure) provided with a high frequency induction heater, to the joining part. |
