Butt laser-welding method for metallic member
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMasanori Kokume, Shinichi Washizu, Yosuke Tateya, Daisuke Noritake, Yuki Kawashita, Jun Ikarashi
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Abstract
Provided is a butt laser-welding method for a metallic member in which a laser beam is scanned so as to repeatedly cross butting surfaces of metallic members to weld the metallic members to each other. When the laser beam is scanned so as to cross the butting surfaces, the closer the laser beam comes to the butting surfaces, the more an irradiation energy density of the laser beam is increased. The bottom surfaces of the molten pools formed on the metallic members are inclined so as to descend toward the butting surfaces.
Claims3
A butt laser-welding method for a metallic member wherein a laser beam is scanned so as to repeatedly cross butting surfaces of metallic members to weld the metallic members to each other, wherein
- when the laser beam is scanned so as to cross the butting surfaces, the closer the laser beam comes to the butting surfaces, the more an irradiation energy density E of the laser beam is increased, the irradiation energy density E being expressed by E=P/(vs×ds), where P is a laser output, vs is a scanning speed of the laser beam, and ds is a spot diameter of the laser beam,
- during welding of the metallic members, a gap and a height difference in a part to be scanned by the laser beam is detected in the butting surfaces, and
- a swing width of the laser beam is changed based on the detected gap and the detected height difference so that the larger the detected gap is and the smaller the height difference is, the more the swing width of the laser beam crossing the butting surfaces increases.
Dependencies are inferred from the claim text.