Laser welding process of welding together overlapped plated steel sheets

摘要

A laser lap welding process of welding together overlapped first (4) and second (5) plated steel sheets, comprising the steps of:
partly deforming at least either of the first (4) and second (5) plated steel sheets so that a space (6) is formed between joining surfaces of the first (4) and second (5) plated steel sheets when the first (4) and second (5) plated steel sheets are joined, to form a gas discharge passage. between parts of the first (4) and second (5) plated steel sheets near a weld line and irradiating parts of the first (4) and second (5) plated steel sheets extending on the weId line with a laser beam (Lw) to weld together the first (4) and second (5) pIated steeI sheets.