| 摘要 |
PURPOSE:To prevent the defective welding of a humping, etc., even increasing a welding speed by providing the recessed part whose upper face side depth is deeper than the depth of the lower face side at least at one part of the butt end face of a welding members, abutting the welding members and butt-welding the gap caused on the end face by a laser beam. CONSTITUTION:The gap 3, 3... of a butt part is formed intermittently in the welding direction and welded by a laser beam B. The gap d1 of the upper part of the gap is larger than the gap d2 of the lower part and the d2 value is taken in 3-25mum. The incidence of the laser light becomes worse in case of d2 less than 3mum. The laser light penetrates the gap in case of d2 exceeding 25mum, and the energy transmission efficiency becomes worse. The length l1 of the upper part gap is longer than that l2 of the lower part gap but may be in the same length. The length of the butt part between gaps is taken less than twice the laser beam diameter. The recessed part of the end face of the welding member 1, 2 is obtainable by working with knurling tool and an unevenness can be formed by the cutting of milling, grinding, etc. |
