Spectroscopic investigation of the high-current phase of a pulsed GMAW process
| Autor: | Klaus-Dieter Weltmann, M E Rouffet, Dirk Uhrlandt, Ruslan Kozakov, Heinz Schoepp, G Goett, M Wendt |
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| Přispěvatelé: | INP-Greifswald, Leibniz Institute for Plasma Science and Technology |
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Acoustics and Ultrasonics
Thermodynamic equilibrium Analytical chemistry chemistry.chemical_element 02 engineering and technology Stark broadening Boltzmann plot 7. Clean energy 01 natural sciences Gas metal arc welding symbols.namesake 0103 physical sciences GMAW Emission spectrum 010302 applied physics Argon Chemistry Plasma 021001 nanoscience & nanotechnology Condensed Matter Physics emission spectroscopy Surfaces Coatings and Films Electronic Optical and Magnetic Materials Plasma arc welding Pulsed gas metal arc welding Stark effect symbols Plasma diagnostics Atomic physics 0210 nano-technology |
| Zdroj: | Journal of Physics D: Applied Physics Journal of Physics D: Applied Physics, IOP Publishing, 2010, 43 (43), pp.434003. ⟨10.1088/0022-3727/43/43/434003⟩ |
| ISSN: | 0022-3727 1361-6463 |
| Popis: | While metal vapours have an important impact on the efficiency of the pulsed gas metal arc welding process, only a few papers are focused on this effect. In this paper, methods based on emission spectroscopy are performed to improve the understanding of the physical phenomena occurring during the high-current pulse. Boltzmann plots applied to iron lines, the Stark broadening of the 696.5 nm argon line and composition calculations assuming local thermodynamic equilibrium are used to determine characteristic parameters of the plasma. It is observed that the central part of the arc is composed mainly of iron. The percentage of iron increases quickly at the beginning of the high-current pulse, and slowly decreases when the central part broadens. During the high-current phase the temperature profile has a minimum value of around 8000 K at the axis of the arc while the argon envelope of the central part reaches temperatures of approximately 13.000 K. The high percentage of iron and the high radiation of the plasma at the centre can explain the measured shape of the temperature profile. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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