| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a repairing method of a tube welding part of a tube plate capable of preventing impurities from further entering a welding part even if there remains a heat medium that affects welding between the tube plate and a tube, without stopping the tube in which a defect occurs at the welding part using a plug, for surely performing a repair-welding with no degradation in welding quality. <P>SOLUTION: A welding part on which a defect of a tube 2 has occurred, on a tube plate 3, is cut off. By enlarging an end part of the tube 2, a gap of the tube 2 relative to a through hole 5 is eliminated. An annular groove 7 is formed by grinding on a contact part between the outer periphery of the enlarged tube 2 and the tube plate 3. A ring 8 is embedded in the annular groove 7. The end part of the tube 2 including the ring 8 is enlarged again. An initial layer is so welded as to fill the annular groove 7 in which the enlarged ring 8 is embedded together with the end part of the tube 2. A second layer is so welded as to backfill the welding part that has been ground, over the initial layer welding part 9. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
