Open AccessAnalysis of Gas Metal Arc Welding (GMAW) regime transition in Ar-CO2/O2 shielding gases
Author(s) -
Quentin Castillon,
M. Wartel,
Nadia Pellerin,
Stéphane Pellerin,
François Faubert,
Jean-Pierre Planckaert,
Francis Briand
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1243/1/012008
Subject(s) - shielding gas , gas metal arc welding , materials science , welding , analytical chemistry (journal) , plasma arc welding , oxide , arc welding , composite material , chemistry , metallurgy , chromatography
An experimental study on MIG-MAG welding in reverse polarity (anode wire) has been implemented to analyse the influence of the active gas type and composition on the welding process. The analysis of the arc column using optical emission spectroscopy and high speed imaging completed by µ-structural study of the electrode wire by EDS/XRD and EPMA methods have provided helpful explanations on the globular/spray mode transition depending of the active gas in the shielding gas. These results highlight the existence of an oxide layer (“gangue”) and the modification of the typology of this one in globular mode according to the active gas (Ar/CO 2 or Ar/O 2 ) probably responsible of the globular/spray mode transfer by modification of the electrical/thermal conductivities of the oxide layer. Spectroscopic analysis reveals modification by an arc constriction in Ar/O 2 mixtures and linked to a more prominent drop of the electronic temperature along the arc column axis. With this active gas, analysis of the Fe I / Ar I emissivity ratio show a higher metal vapours content responsible for the temperature drop by their strong radiative emission along the arc column.