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Modeling of Welding Process and its Application to Laser Materials Processing

Research Project

Project/Area Number 07555520
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Material processing/treatments
Research InstitutionOsaka University

Principal Investigator

OHJI Takayoshi  Osaka University, Faculty of Eng., Professor, 工学部, 教授 (00089880)

Co-Investigator(Kenkyū-buntansha) OHKUBO Akira  Osaka University, Faculty of Eng., Assistant, 工学部, 助手 (40260632)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1996: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsLaser Welding / Arc Welding / Mathematical Modeling / Heat Transfer / UV Radiation Thermometry / Optimization / Inverse Heat Conduction Problem / キ-ホール / 熱輸送過程 / 溶接条件 / 紫外線温度計測
Research Abstract

In this work, a feasibility study has been conducted to determine if a numerical model can be used for optimizing laser or arc welding processes.
In the first part of this work, a mathematical model of welding process has been discussed, where the equation of heat conduction is numerically analyzed to estimate the molten pool size in welding, and a surface tensional balance equation is solved numerically to obtain the molten pool surface profile in welding. As a result of the comparison between model analysis and experiment on laser or arc welding, it is made clear that the numerical model, developed in this work, is a useful tool for the simulation of laser or arc welding process.
In the second part of this work, the radiation thermometry has been applied to monitor the temperature field in laser or arc welding process.The reliability of the thermometry is, however, limited under the condition that the emissivity of the work to be measured is not accurately known as in the case of laser or arc welding process.
In order to avoid the above emissivity problem, an UV (ultra-violet) radiation thermometry has been proposed and discussed experimentally. A measuring system of CCD camera with UV-filter, used in the present work, made it possible to detect the temperature image on the plate in welding without any emissivity correction.
It is concluded that a model reference control system of welding is possible by using the model and the UV radiation thermometry developed in this work.

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (32 results)

All Other

All Publications (32 results)

  • [Publications] 松廣 克之: "高エネルギー密度ビーム溶接におけるキ-ホール形成限界について" 溶接学会論文集. 13. 212-222 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takayoshi OHJI: "Measurement of plasma plume in laser welding by IR radiation" Laser Materials Processing. 80. 729-738 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 桝谷 武司: "パイプの円周溶接のモデル化に関する検討" 溶接学会論文集. 14. 649-653 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 佐藤 隆康: "紫外線放射測温法による温度分布計測" 溶接学会論文集. 15. 64-69 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 近藤 勝義: "パイプの円周溶接における最適入熱制御に関する研究" 溶接学会論文集. 15. 494-501 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 佐藤 隆康: "紫外線放射測温法による溶融池温度場の計測" 溶接学会論文集. 15. 631-369 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 黄地 尚義: "溶接・接合プロセスの基礎" 産報出版, 262 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yoshiyuki MATSUHIRO,et al.: "Study on keyhole formation of laser welding" Quarterly J.of Japan Weld.Soc.Vol.13 (in Japanese). 218-222 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takayoshi OHJI,et al.: "Measurement of plasma plume in laser welding by IR radiation" Laser Materials Processing. Vol.80. 729-738 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takeshi MASUTANI,et al.: "A mathematical modeling of circumferential GTA welding of pipes" Quarterly J.of Japan Weld.Soc.Vol.14 (in Japanese). 649-653 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takayasu SATO,et al.: "Temperature measurement by UV thermal radiation" Quarterly J.of Japan Weld.Soc.Vol.15 (in Japanese). 65-69 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Katsuyoshi KOHDOH,et al.: "Optimum heat input control in arc welding on small sized pipes" Quarterly J.of Japan Weld.Soc.Vol.15 (in Japanese). 494-501 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takayasu SATO,et al.: "Measurement of temperature distribution of molten pool by UV thermal radiation" Quarterly J.of Japan Weld.Soc.Vol.15 (in Japanese). 631-638 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Takayoshi OHJI: Fundamentals of Welding Processes. Sanpo Pub.Inc. (in Japanese), (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 松廣克之: "高エネルギー密度ビーム溶接におけるキ-ホール形成限界について" 溶接学会論文集. 13. 212-222 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] Takayoshi OHJI: "Measurement of plasma pluma in laser welding by IR rediation" Laser Materials Processing. 80. 729-738 (1995)

    • Related Report
      1997 Annual Research Report
  • [Publications] 桝谷武司: "パイプの円周溶接のモデル化に関する検討" 溶接学会論文集. 14. 649-653 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 佐藤隆康: "紫外線放射測温法による溶融池温度場の計測" 溶接学会論文集. 15. 64-69 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 近藤勝義: "パイプの円周溶接における最適入熱制御に関する研究" 溶接学会論文集. 15. 494-501 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 佐藤隆康: "紫外線放射測温法による温度分布計測" 溶接学会論文集. 15. 631-638 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 黄地尚義: "溶接・接合プロセスの基礎" 産報出版, 262 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 松廣克之: "高エネルギ密度ビーム溶接におけるキ-ホール形成限界について" 溶接学会論文集. 13・2. 218-222 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Takayoshi.OHJI: "Measurement of plasma plume in laser welding by 1R radstion" Laser Materials Pracessing(ICALEO'95). Vol.80. 729-738 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Takayoshi OHJI: "A mathematical model for circumferential GTA welding of pipe." International Institute of Welding,IIW. IIW Doc.212-892-96. 1-8 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Takeshi MASUTANI: "A mathematical modeling of circumferential GTA welding of pipes" Proc.of 6th Int.Symp.of J,Welding Soc.(1996)Nagoya. 619-624 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 桝谷武司: "パイプの円周溶接のモデル化に関する検討" 溶接学会論文集. 14・4. 649-653 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 佐藤隆康: "紫外線放射測温法による温度分布計測" 溶接学会論文集. 15・1(掲載予定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 黄地尚義: "溶接・接合プロセスの基礎" 産報出版, 262 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 松廣,克之: "高エネルギ密度ビーム溶接におけるキ-ホール形成限界について" 溶接学会論文集. 13. 218-222 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Takayoshi OHJI: "A mathematical model for laser welding with keyhole" laser Materials Processing(ICALEO'94). 79. 471-479 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 黄地,尚義: "紫外線放射計測による温度場の測定" 溶接学会論文集. 12. 368-373 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] Takayoshi OHJI: "Measrement of plasma plume in laser welding by IR rodiation" Laser Materials processing(ICALEO'95). 80(to be published).

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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