LASER WELD METHOD AND WELD STRUCTURE

摘要

A laser welding method includes: forming a melted section (Y) in which plural metallic workpieces (W1, W2) within a weld region (S) are melted by projecting a first laser beam (L1) onto said weld region with parts of the workpieces (W1, W2) being set as the weld region (S) when the workpieces (W1, W2) are welded; and projecting a second laser beam (L2) while the melted section (Y) is being solidified or after a solidified section in which the melted section (Y) is solidified is formed such that the second laser beam (L2) circles around center (C) of the melted section (Y) or the solidified section from an irradiation start position deviated from said center (C) toward said center (C) or such that the second laser beam (L2) is focused to the center (C) of the melted section (Y) or the solidified section from the irradiation start region that includes the center (C) and a periphery thereof.