Method and apparatus for laser working, especially in a tube

摘要

Focusing of the laser beam onto the working point (6) is carried out by means of a partially reflective deviating mirror (7) which allows a small and defined proportion of the laser beam to pass through, and the light intensity having passed through the mirror is measured. It is thus possible to increase the output power of the laser progressively as the mirror loses its cleanliness. Application to the sleeving of steam-generator tubes using laser welding. <IMAGE>