| 摘要 |
PROBLEM TO BE SOLVED: To reduce defect such as generation of strength lowering, difficulty in arranging a fixed clearance between steel plates with good reproducibility, etc., in the lap laser beam welding of plated steel plates. SOLUTION: A laser beam is condensed on stacked plated steel plates 2, welding is conducted while scanning the optical axis 7 of a laser beam 1 in two dimensional locus and traveling one after another welding parts, the scanning width is set to a condensing spot diameter 4 of the laser beam of >=2 holds to <=10 holds for all directions around a reference axis 3 of the optical axis 7 of the laser beam. In the case scanning pattern is circular or elliptical movement, overlapping of locus of the optical axis 7 of the laser beam on steel plate is restricted in a fixed range. |
