Laser welding line for repairing a closure fault of a metal tube containing at least one transmission optical fiber

Repair line for implementing a method of repairing a closure defect of a metal tube containing at least one transmission optical fiber, said defect being situated on a closure generatrix of said tube, by bending and applying mechanical tension to a portion of said tube including said defect to make said closure generatrix convex to force each fiber inside the tube at the location of said defect to be positioned against said tube on the side opposite said defect, and laser welding said defect point by point using heat input at each point adjusted to substantially the value required for the weld, which repair line includes respective leading stations for a feed spool and a take-up spool for said tube, means for feeding said tube along a direct path between said spools coupled to a system controlling movement along and stopping of said tube on said path, a repair station on a repair path which is offset relative to said path, a laser for welding said tube point by point and a tube conditioning system for bending said tube and applying mechanical tension to said tube opposite said laser, wherein said conditioning system includes a support member for said tube having a front face of substantially convex longitudinal shape and first and second means for guiding and tensioning said tube mounted on opposite sides of said support member and defining said repair path with said support member.