LASER WELDING APPARATUS, PREVENTIVE MAINTENANCE METHOD FOR THE REACTOR INTERIOR OF A NUCLEAR POWER PLANT, AND LASER CUTTING APPARATUS.

摘要

The laser welding apparatus comprises a welding head and a welding head scanning apparatus. A collimating lens installed on a head body of the welding head is arranged facing an end face of optical fibers. The welding head includes only the collimating lens as a lens and the length is shortened.