METHOD FOR LASER BEAM WELDING

摘要

PROBLEM TO BE SOLVED: To prevent the generation of such a weld defect as a porosity, a blow hall, a crack, or the like in a keyhole welding with a laser beam. SOLUTION: A welding is performed by cyclically varying a laser beam output at a frequency which is coincident with a natural frequency of a molten metal pool in the keyhole welding with a laser beam for which a pulse modulation of output is performed.