Laser welding method for stacked workpieces

Details Laser welding method for stacked workpieces Laser welding method for stacked workpieces

B - Operations, Transporting

23

K

B23K 26/20 (2006.01) B23K 26/04 (2006.01)

Patent

CA 2660062

A laser welding method for stacked workpieces according to the present invention, a laser irradiation diameter that is irradiated on a surface of one workpiece 1 among two stacked workpieces 1 and 2 is set such that a laser irradiation diameter B at a weld ending-edge portion is equal to or greater than approximately 1.5 times a laser irradiation diameter A at a weld starting-edge portion. Thus, at the weld ending- edge portion, the material is melted in a wider area compared to the conventional example, and therefore, the melted material is supplied to the center portion of the weld ending-edge portion while the weld ending-edge portion is solidifying. As a result, a depth of the recess at the weld ending-edge portion can be made shallow enough to guarantee the welding quality of each of the workpieces 1 and 2.

Dans le procédé de soudage laser de pièces chevauchées selon l'invention, le diamètre d'irradiation d'un faisceau laser à appliquer sur la surface d'une pièce (1) de pièces chevauchées (1, 2) est déterminé de sorte à présenter un diamètre d'irradiation laser (B) au niveau d'une partie bord de fin de soudage 1,5 fois supérieur au moins à un diamètre d'irradiation laser (A) au niveau de la partie bord de début de soudage. Ainsi, au niveau de la partie bord de fin de soudage, un matériau est soudé sur une plage plus large que dans les cas classiques. Le matériau soudé est déplacé vers la partie centrale de la partie bord de fin de soudage lorsque ladite partie coagule et la profondeur de la partie bord de fin de soudage est réduite jusqu'à un niveau qui garantit les qualités de soudage des pièces (1, 2).

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