Laser beam welding stick, its use for tube sleeving and optical fibre integrity monitoring process

摘要

This welding cane (hollow rod) is fitted with a welding head (1) comprising an optical fibre (5) which emits a laser beam focused by an optical device (9) onto a wall (10) to be welded where a weld pool (12) is formed. …??The welding head (1) includes a photoelectric cell (45) illuminated by the light scattered around the end of the optical fibre. The signal emitted by the photoelectric cell (45) depends on the integrity of the optical fibre (5) and on the energy used for the welding. …??Application to the welding of a sealing sleeve in a tube of a pressurised-water nuclear reactor steam generator. …IMAGE…