LASER BEAM WELDING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a means which is capable of performing reliable joining in the overhead welding even with a groove gap, and efficiently performing the all-position welding such as the full-circumferential welding of a horizontal pipe, and unnecessary for groove precision even when welding a thick plate in a laser beam welding method while feeding a filler wire to a weld part.

SOLUTION: In the laser beam welding to melt a filler wire 5 and a work W to be welded by irradiating laser beams L while feeding the filler wire 5 to a weld part of the work W, plasma plumes P1 and P2 are generated in the weld part by irradiating laser beams L, and a molten metal 8 is fed to an inner distal side of the weld part by the evaporation reaction force caused by generation of the plasma plumes P1 and P2.

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