LASER BEAM WELDING METHOD OF GALVANIZED STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a laser beam welding method capable of suppressing generation of blow holes without oxidizing zinc vapor when performing the laser beam welding of a workpiece in which galvanized steel sheets are combined with each other, or a galvanized steel sheet is combined with other metal.

SOLUTION: Laser beam welding is performed by applying laser beams 3 adjusted so that the ratio of the focal distance to the spot diameter at the focal position is≥300 to a weld part of a workpiece 2 while jetting a shield gas to a laser beam irradiation position to the laser beam applying position of the workpiece from a nozzle 11 provided in a side space between a laser head for outputting laser beams and the workpiece 2.

COPYRIGHT: (C)2008,JPO&INPIT