E. S. Surian, Faculty of Engineering, National University of Lomas de Zamora, Buenos Aires, Argentina; H. G. Svoboda, Faculty of Engineering, Univ. National of Buenos Aires, Buenos Aires, Argentina; N. M. Ramini de Rissone, Regional Faculty of San Nicolas, National Technological University, San Nicolas, Argentina; L. A. De Vedia, Instituto de Tecnología Jorge Sabato, UNSAM-CNEA, CIC, Buenos Aires, Buenos Aires, Argentina

Summary: The effect that the utilization of CO2 and a mixture 80% Ar / 20%CO2 shielding gases, flat and vertical up welding positions, arc energy and 2 or 3 passes per layer have on the all-weld metal microstructure and mechanical properties from an ANSI/AWS A5.29-98 E111T5-K3/K4 metal cored wire, 1.2 mm diameter was studied. Hardness, tensile and impact tests were determined and metallographic study was performed.