UNDERWATER LASER REPAIR WELDING EQUIPMENT AND UNDERWATER LASER REPAIR WELDING METHOD

摘要

PPROBLEM TO BE SOLVED: To provide underwater laser repair welding equipment and an underwater laser repair welding method capable of applying laser repair welding to an underwater structure having a crack with an opening part on the surface, and capable of sealing the opening part on the surface of the crack, and to provide an underwater laser repair welding method. PSOLUTION: In the underwater laser repair welding equipment where an underwater welding head connected to a laser oscillator and a shielding gas feed source, and having a feed source and a feed system of welding wire and an optical system condensing laser light is provided, and the part to be welded in an underwater structure is subjected to repair welding: the part of a nozzle 20 fitted to the tip of the underwater welding head 3 is provided with a nozzle central hole 21 applying laser light and feeding shielding gas to the part 34 to be welded in the underwater structure and a precedence hole 22 jetting shielding gas toward the progressing direction of welding separately from the nozzle central hole 21. PCOPYRIGHT: (C)2005,JPO&NCIPI