COMPOSITE WELDING METHOD

• Main Authors: NOBUTOKI TOMOKAZU, TOMIMURA HIROKI, SAKURADA YASUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 11.03.2021
• 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 composite welding method by which post-welding deformation in welded members is reduced and excellent welding beads are formed.SOLUTION: Provided is a composite welding method composed of laser welding and arc-welding, and that performs welding under a condition in which: a front face of a first welded member is butted to an end face of a second welded member; a laser beam diameter φL of the laser welding and a welding wire diameter φA of the arc-welding are selected in a manner in which a formula (1) can be satisfied by a ratio (ρA/ρL) of an energy density ρA of the arc-welding to an energy density ρL of the arc-welding; a formula (2) is satisfied by a heat input amount QL of the laser welding and an input heat amount QA of the arc-welding; and a formula (3) is satisfied by a ratio (Vq/Vt) of a volume Vq of an apparent input heat area in the second welded member to a unit volume Vt of the first welded member in a contact area of the first welded member and the second welded member.SELECTED DRAWING: Figure 1 【課題】被溶接部材における溶接後の変形を低減しつつ、良好な溶接ビードを形成するための複合溶接方法を提供する。【解決手段】レーザ溶接及びアーク溶接による複合溶接方法であって、第１被溶接部材の表面と第２被溶接部材の端面とを突き合わせて、前記アーク溶接のエネルギー密度ρＡと前記レーザ溶接のエネルギー密度ρＬとの比率（ρＡ／ρＬ）が式（１）を満たすように、前記レーザ溶接のレーザビーム径φＬ及び前記アーク溶接の溶接ワイヤ径φＡを選択するとともに、レーザ溶接の入熱量ＱＬ及びアーク溶接の入熱量ＱＡが式（２）を満たし、かつ、前記第２被溶接部材における見かけの入熱領域の体積Ｖｑと、前記第１被溶接部材及び前記第２被溶接部材の接触領域における前記第１被溶接部材の単位体積Ｖｔとの比率（Ｖｑ／Ｖｔ）が式（３）を満たす条件で溶接を行う。【選択図】図１