2018 Fiscal Year Final Research Report
Elucidation of non-axisymmetric arc plasma by development of three-dimensional optical emission spectroscopic method
| Project/Area Number |
16K06746
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Composite materials/Surface and interface engineering
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | プラズマ診断 / 非軸対称プラズマ / トモグラフィ / 発光分光法 / 干渉フィルタ / GMA溶接 |
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| Outline of Final Research Achievements |
We developed three-dimensional optical emission spectroscopic method to diagnose complex heat characteristics in the arc welding. Welding arc plasma often presents non-axisymmetric and non-stationary appearance. Therefore, the temperature and metal vapor concentration distribute three-dimensionally. To measure such a phenomenon, we constructed multicolor, multidirectional, simultaneous measurement system based on tomography. In this study, the welding arc characteristics in various droplet transfer modes was experimentally revealed regarding Gas Metal Arc welding (MIG arc, CO2 arc, MAG arc). Although the spectral lines required to measure each welding mode are different, we established the methods to convert the measurement values to physical values such as temperature.
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| Free Research Field |
アーク溶接
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| Academic Significance and Societal Importance of the Research Achievements |
溶接アークプラズマに関する先行研究では，現象を軸対称と仮定する研究がほとんどであるが，本研究により溶接アークの温度分布や金属蒸気分布を三次元的に計測することが可能となった．産業界においては，施工の高効率化や省力化として，複数の熱源を同時に用いるような，そもそも非軸対称となる施工法も多くある．しかし現象が複合的になるため支配要因の抽出，最適化は非常に困難である．そうした現象の計測手法が求められているのも事実であり，本研究の手法は今後多く応用されていくと期待できる．
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