S. Zielinska, K. Musiol, Institut of Physics, Krakow, Poland; N. Pellerin, CRMHT, Bourges cedex, France; S. Pellerin, C. De Izarra, LASEP, Bourges cedex, France; F. Briand, F. Richard, T. Opderbecke, Centre Technique des Applications du Soudage (CTAS-AIR LIQUIDE Welding), Cergy Pontoise cedex, France

Summary: Increase of the percentage of CO2 in argon, results in increase of the transition current value from the globular to spray mode during the welding MIG-MAG process. To explain this phenomenon, the MIG/MAG welding arc plasma was investigated using fast camera, spectroscopic diagnostic and microstructural modifications of the anode tip.