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

Research Project

Project/Area Number 20K14650
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionOsaka 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
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2022: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2021: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2020: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Keywordsアーク / 溶接 / 流体工学 / 可視化 / サブマージアーク溶接 / 粒子法 / スラグ / シミュレーション / アークプラズマ / 溶滴移行現象
Outline of Research at the Start

サブマージアーク溶接は熱効率が高く,深い溶込みが得られるため大型構造物の建造に多く用いられている.近年この溶接法用にデジタル溶接電源が開発され,電流電圧波形制御による高能率な溶接が期待されている.しかしながら,サブマージアーク溶接では溶接部が粉体に覆われており,外部からその溶接現象を見ることは難しい.したがって溶接技能者はデジタル溶接電源の複雑な設定条件が溶接中の諸現象に与える影響が不明なまま最適な条件を探さなくてはならず,生産性の低下を招いている.そこで本研究ではサブマージアーク溶接現象を一挙に解く数値演算モデルを確立し,電源の各設定条件が溶接現象に与える影響を明らかにすることを目的とする.

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.

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.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (6 results)

All 2023 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Two-Dimensional Particle Simulation of Flux- Wall Guid ed Transfer in Submerged Arc Welding2023

    • Author(s)
      古免 久弥, 森本 堅太, 田中 学, 寺崎 秀紀
    • Journal Title

      Journal of Smart Processing

      Volume: 12 Issue: 2 Pages: 91-96

    • DOI

      10.7791/jspmee.12.91

    • ISSN
      2186-702X, 2187-1337
    • Year and Date
      2023-03-10
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Three-dimensional numerical simulation of slag formation and transfer processes during metal active gas welding using particle method2023

    • Author(s)
      Takamasa Fukazawa, Hisaya Komen, Masaya Shigeta, Manabu Tanaka, Tetsuo Yamada, Naoko Saito, Mitsugi Fukahori
    • Organizer
      IIW Commission I, IV, XII Intermediate Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Particle-based Simulation of Slag Transfer Process During Metal Active Gas Welding2022

    • Author(s)
      Takamasa Fukazawa, Hisaya Komen, Masaya Shigeta, Manabu Tanaka, Mitsugi Fukahori, Naoko Saito, Tetsuo Yamada
    • Organizer
      Visual-JW 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 粒子法シミュレーションを用いたマグ溶接時のスラグ輸送過程の支配的因子の調査2021

    • Author(s)
      深澤 孝公,古免 久弥,茂田 正哉,田中 学
    • Organizer
      (一社)溶接学会 2021年度 秋季全国大会
    • Related Report
      2021 Research-status Report
  • [Presentation] SPH粒子法に基づくアーク接合シミュレーション2021

    • Author(s)
      古免 久弥
    • Organizer
      (独)日本学術振興会第153委員会第151回研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] Particle-based simulation of molten metal behavior during arc welding process2021

    • Author(s)
      Hisaya Komen
    • Organizer
      The 1st Okinawa-International Conference on Welding and Allied Technology
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2020-04-28   Modified: 2024-01-30  

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