Gas influence on the arc shape in MIG-MAG welding S. Zielinska, S. Pellerin, F. Valensi, K. Dzierzega, K. Musiol, Ch. de Izarra and F. Briand Eur. Phys. J. Appl. Phys., 43 1 (2008) 111-122 Published online: 24 June 2008 DOI: 10.1051/epjap:2008106