A method of forming a hem joint using laser welding

摘要

The present invention relates to a method of forming a ham joint using laser welding for joining two panels to a flange, comprising the steps of: forming a flange (11) on a first panel (10) A contact portion 12 and a laser welding portion 13 are formed which contact the flange 21 of the second panel 20 and the flange 11 is formed with a bent portion 11a, step; After the flange 21 of the second panel 20 is disposed on the inner side surface 11 of the first panel 10 and the flange 11 of the first panel 10 is bent with respect to the bent portion 11a of the first panel 10, Wherein a sealing material 30 is applied between the bent portion 11a of the flange 11 and the end face 21a of the flange 21 of the first panel 20, A hemming step in which a discharge passage 40 is formed between the welded portion 13 of the first panel 10 and the sealing material 30 and a laser beam B of the laser L is applied to the welded portion 13, And a laser welding step in which the generated gas generated during laser welding is discharged to the outside through the discharge passage (40).