AustralieFrV1, Main, Exploration, bibRecord, 004C45

Study of the spray to globular transition in gas metal arc welding: a spectroscopic investigation

Identifieur interne : 004C45 ( Main/Exploration ); précédent : 004C44; suivant : 004C46

Study of the spray to globular transition in gas metal arc welding: a spectroscopic investigation

Auteurs : F. Valensi [France] ; S. Pellerin [France] ; Q. Castillon [France] ; A. Boutaghane [Algérie] ; K. Dzierzega [Pologne] ; S. Zielinska [France, Pologne] ; N. Pellerin [France] ; F. Briand [France]

Source :

Journal of physics. D, Applied physics : (Print) [ 0022-3727 ] ; 2013.

RBID : Pascal:13-0276416

Descripteurs français

Pascal (Inist)
- Soudage arc, Effet Stark, Colonne plasma, Spectrométrie émission, Diagnostic plasma, Donnée expérimentale, Etude expérimentale, Densité électron, Intensité raie, Blindage, Méthode optique, Argon, Fer, 5277F, 5270, 5270K, Paramètre plasma.
Wicri :
- topic : Fer.

English descriptors

KwdEn :
- Arc welding, Argon, Electron density, Emission spectroscopy, Experimental data, Experimental study, Iron, Line intensity, Optical method, Plasma column, Plasma diagnostics, Plasma parameter, Shielding, Stark effect.

Abstract

The gas metal arc welding (GMAW) process is strongly influenced by the composition of the shielding gas. In particular, addition of CO₂ increases the threshold current for the transition from unstable globular to more stable spray transfer mode. We report on the diagnostics-using optical emission spectroscopy-of a GMAW plasma in pure argon and in mixtures of argon, CO₂ and N₂ while operated in spray and globular transfer modes. The spatially resolved plasma parameters are obtained by applying the Abel transformation to laterally integrated emission data. The Stark widths of some iron lines are used to determine both electron density and temperature, and line intensities yield relative contents of neutral and ionized iron to argon. Our experimental results indicate a temperature drop on the arc axis in the case of spray arc transfer. This drop reduces with addition of N₂ and disappears in globular transfer mode when CO₂ is added. Despite the temperature increase, the electron density decreases with CO₂ concentration. The highest concentration of iron is observed in the plasma column upper part (close to the anode) and for GMAW with CO₂. Our results are compared with recently published works where the effect of non-homogeneous metal vapour concentration has been taken into account.

Affiliations:

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Le document en format XML

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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Arc welding</term>
<term>Argon</term>
<term>Electron density</term>
<term>Emission spectroscopy</term>
<term>Experimental data</term>
<term>Experimental study</term>
<term>Iron</term>
<term>Line intensity</term>
<term>Optical method</term>
<term>Plasma column</term>
<term>Plasma diagnostics</term>
<term>Plasma parameter</term>
<term>Shielding</term>
<term>Stark effect</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Soudage arc</term>
<term>Effet Stark</term>
<term>Colonne plasma</term>
<term>Spectrométrie émission</term>
<term>Diagnostic plasma</term>
<term>Donnée expérimentale</term>
<term>Etude expérimentale</term>
<term>Densité électron</term>
<term>Intensité raie</term>
<term>Blindage</term>
<term>Méthode optique</term>
<term>Argon</term>
<term>Fer</term>
<term>5277F</term>
<term>5270</term>
<term>5270K</term>
<term>Paramètre plasma</term>
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<front><div type="abstract" xml:lang="en">The gas metal arc welding (GMAW) process is strongly influenced by the composition of the shielding gas. In particular, addition of CO<sub>2</sub>
 increases the threshold current for the transition from unstable globular to more stable spray transfer mode. We report on the diagnostics-using optical emission spectroscopy-of a GMAW plasma in pure argon and in mixtures of argon, CO<sub>2</sub>
 and N<sub>2</sub>
 while operated in spray and globular transfer modes. The spatially resolved plasma parameters are obtained by applying the Abel transformation to laterally integrated emission data. The Stark widths of some iron lines are used to determine both electron density and temperature, and line intensities yield relative contents of neutral and ionized iron to argon. Our experimental results indicate a temperature drop on the arc axis in the case of spray arc transfer. This drop reduces with addition of N<sub>2</sub>
 and disappears in globular transfer mode when CO<sub>2</sub>
 is added. Despite the temperature increase, the electron density decreases with CO<sub>2</sub>
 concentration. The highest concentration of iron is observed in the plasma column upper part (close to the anode) and for GMAW with CO<sub>2</sub>
. Our results are compared with recently published works where the effect of non-homogeneous metal vapour concentration has been taken into account.</div>
</front>
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Study of the spray to globular transition in gas metal arc welding: a spectroscopic investigation

Study of the spray to globular transition in gas metal arc welding: a spectroscopic investigation

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