JP2015163412A5 - - Google Patents

Claims (8)

A method of laser welding a plate-like first member and a plate-like second member,
The first member and the second member are arranged so that the wide surfaces of the first member and the second member are orthogonal to each other, and the side surface of the second member is substantially flush with the wide surface of the first member. The side surface portion of the first member and the wide surface end portion of the second member are abutted with each other. Here, the side surface portion of the first member facing the second member is defined as a first joint surface, and the first member is When the wide surface end portion of the second member facing each other is the second joint surface, the dimension of the first member in the direction perpendicular to the first joint surface is perpendicular to the second joint surface of the second member. Larger than the dimension in the direction of
A first laser beam having an intensity capable of generating a keyhole is irradiated along the first joint surface on the wide surface of the first member to form a first molten pool that is melted by the first laser beam. Wherein the first molten pool is formed across the second member; and the second laser light having a lower intensity than the second laser beam capable of generating a keyhole is formed on the side surface of the second member. Irradiating along the joining surface to form a second molten pool melted by the second laser beam, wherein the second molten pool is formed across the first member;
Including
The first molten pool and the second molten pool are integrated with each other to form a molten pool, and the first member and the second member are welded by a weld portion formed by solidifying the molten pool. Welding method. The welding method according to claim 1, wherein an output density I ₁ of the first laser light is 5.6 × 10 ⁶ W / cm ² ≦ I ₁ <1.1 × 10 ⁸ W / cm ² . 3. The welding method according to claim 1, wherein an output density I ₂ of the second laser light is 2.8 × 10 ⁶ W / cm ² ≦ I ₂ <5.6 × 10 ⁶ W / cm ² . When the output density I ₂ of the second laser light is 3.8 × 10 ⁶ W / cm ² or more and less than 5.6 × 10 ⁶ W / cm ² ,
The welding method according to claim 3, wherein a scanning speed of the first laser beam and the second laser beam is set to 20 m / min or more. When the output density I ₂ of the second laser light is 2.8 × 10 ⁶ W / cm ² or more and less than 3.8 × 10 ⁶ W / cm ² ,
The welding method according to claim 3, wherein a scanning speed of the first laser beam and the second laser beam is less than 20 m / min. Said first and output densities I ₁ of the laser beam and the power density I ₂ of the second laser light, satisfy I ₁ ≧ 5 × I _2, the method of welding according to claim 1 It said first and irradiation diameter d ₁ of the laser beam and the irradiation diameter d ₂ of the second laser beam, d 1 satisfy _{<d 2,} welding method according to any one of claims 1-6. Wherein the depth Dw of the welded portion of the joint surface of the first or section orthogonal to the second mating surface, the dimension L ₂ perpendicular to the second joint surface of said second member, Dw ≧ L The welding method according to any one of claims 1 to 7, which satisfies ₂ .