| 摘要 |
A process is claimed for repairing local deterioration in a heat exchanger tube (20) incorporating at least one damaged part close to one end of the tube fixed in a perforation (32) of a plate of tubes, consisting of:- cutting the tube beyond the damaged part; extracting via the perforation a section of the tube containing the damaged part and its end; introducing via the perforation a replacement section of tube (21); butt welding the replacement section of tube (21) to the remaining tube (20), inside the tube and under a neutral gas atmosphere. Before welding the tube, a confining component (30) for the neutral gas is introduced via the perforation and placed around the region to be welded. USE/ADVANTAGE - The process is used for repairing local damage in heat exchanger tubes, notably those associated with a nuclear reactor which are in particularly corrosive environments and thus subject to local deterioration such as cracking, notably in the zone immediately adjacent to the part of the tubes fixed to the tube plate. The use of a neutral atmosphere during the welding operation eliminates the risk of oxidn. in the weld without the need for intervention in the secondary part of the steam generator and ensures a good quality weld.
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