LASER WELDING METHOD

• Main Author: MATSUO RYUTA
• Format: Patent
• Language: English; Japanese
• Published: 13.10.2023
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

To provide a laser welding method in which poor welding caused by blow-off of steam of plated metal such as zinc can be reduced, without requiring cumbersome work.SOLUTION: A laser welding method, in which a plurality of plated metal plates plated with metal which is lower in melting point than a metal plate of a base material are overlapped and welded, includes: an overlapping step of overlapping the plurality of plated metal plates; a plated layer evaporating step of emitting laser light for removing plating to weld regions on surfaces of the plated metal plates on a top layer overlapped in the overlapping step and evaporating a plated layer between the overlapped plated metal plates, by making the laser light for removing plating reach the plated metal plate on a bottom layer; and a welding step of emitting laser light for main welding which is larger in condensing diameter than the laser light for removing plating to the weld region after the plated layer evaporating step, and welding the plurality of plated metal plates by melting the metal plate of the base material.SELECTED DRAWING: Figure 2 【課題】煩雑な作業を要することなく、亜鉛等のメッキ金属の蒸気の吹き出しによる溶接不良を低減できるレーザー溶接方法を提供する。【解決手段】母材金属板よりも低い融点の金属でメッキされた複数の金属メッキ板を重ね合わせて溶接するレーザー溶接方法であって、複数の金属メッキ板を重ね合わせる重ね合わせ工程と、重ね合わせ工程において重ね合わされた最上層の金属メッキ板の表面の溶接領域にメッキ除去用のレーザー光を照射し、メッキ除去用のレーザー光を最下層の金属メッキ板に到達させて、重ね合わされた金属メッキ板の間のメッキ層を蒸発させるメッキ層蒸発工程と、メッキ層蒸発工程の後に、溶接領域に、メッキ除去用のレーザー光よりも集光径の大きい本溶接用のレーザー光を照射し、母材金属板を溶融して複数の金属メッキ板を接合する接合工程と、を有する。【選択図】図２