| 摘要 |
PROBLEM TO BE SOLVED: To provide a lap laser beam welding method of metallic conductor sheets capable of improving the weldability without substantially complicating the manufacturing process and/or increasing the cost.SOLUTION: The lap laser beam welding method includes: a laser beam temporarily applying step of forming a projecting part 15 projecting outwardly from a first welding surface 11 by melting and solidifying the surface while irradiating the first welding surface 11 of a first metallic conductor sheet 1 with a laser beam 8 with the lower output than that for the welding; and a laser beam permanently applying step of forming a contact part at which the projecting part 15 and a second welding surface 21 are brought into contact with each other by lapping the second welding surface 21 of a second metallic conductor sheet 2 on the first welding surface 11 of the first metallic conductor sheet 1 so as to be opposite to each other, and forming a weld part 35 by irradiation with the laser beam 8 so as to penetrate the contact part 3 from a laser beam irradiation surface 22 of the second metallic conductor sheet 2. |
