Electromagnetic Thermo-Fluid Analysis of Arc Plasma, Metal and Slag Behaviors in Powder Flux

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14650
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 19010:Fluid engineering-related
• Research Institution: Osaka University (2021-2022); Kumamoto University (2020)
• Principal Investigator: Komen Hisaya 大阪大学, 接合科学研究所, 講師 (80847989)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: アーク / 溶接 / 流体工学 / 可視化

Outline of Final Research Achievements

The purpose of this study was to clarify the influence of welding conditions on welding phenomena by experimentally observing the inside of cavities during submerged arc welding and predicting these welding phenomena by numerical simulations. In the experimental observation, molten metal droplet transfer during this welding at low welding currents was successfully observed directly. Developed numerical model succeeded in simulating the unique molten metal droplet transfer of submerged arc welding called the flux-wall guided transfer. Numerical results suggested that the Lorentz force and cavity pressure acting on the molten metal are important for this transfer to occur during the welding. Slag transport on a weld pool was also modeled, and the dominant driving force for slag transport on the weld pool was clarified.

Free Research Field

溶接工学

Academic Significance and Societal Importance of the Research Achievements

本研究成果を活用することでサブマージアーク現象の理解が進み，サブマージアーク溶接施工の高度化が期待できる．そしてサブマージアーク溶接の施工技術が高度化することで，この溶接プロセスを用いて建造される大型構造物の生産能率向上が見込める．またこの溶接プロセスは電磁流体工学や粉体工学，材料工学などを含んでいる．したがって溶接分野だけではなく，これらの工学を取り扱う他分野においても，本研究で得られた知見が共有することができるため，本研究成果は学術貢献度も高いといえる．