Resumen

LOZANO, J.; MOREDA, P.; LLORENTE, C. L.  y  BILMES, P. D.. Fusion characteristics of austenitic stainless steel gmaw welds. Lat. Am. appl. res. [online]. 2003, vol.33, n.1, pp.27-31. ISSN 0327-0793.

Shielding gas is a key element in GMAW (Gas Metal Arc Welding). It represents only a small percentage of the overall production cost, and its proper choice makes possible to obtain well shaped and faultless beads, increasing both productivity and quality and therefore resulting cost saving. The influence of several shielding gases on the fusion characteristics of GMAW using solid wires of austenitic stainless steels is assessed in this work. Beads on plate welds are performed on AISI 304 steel plates using ER 308LSi welding wire according to AWS A5.9 and the following shielding gases: Ar, Ar-O₂, Ar-CO₂, Ar-He-CO₂, He-Ar-CO₂, Ar-CO₂-NO_, Ar-NO, Ar-He-H₂, Ar-He. For these gas mixtures, stability and geometry of the weld are evaluated, determining depth of penetration, bead reinforcement height, width of the bead, wetting angle, fusion angle, total fusion area, plate fusion area and dilution. A comparative analysis of the results which are obtained with the different gas mixtures is carried out.

Palabras clave : Welding; stainless steel; shielding gases; GMAW process.

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