Caracterização do metal de solda obtido com arame aws er 70 s-6 em função da adição de fluxo ativo e vazão do gás de proteção co2 em solda bead on plate no aço astm a36

Abstract

Welding studies show the influence of active flux on the weld bead geometry in GTAW, EBW, LBW, and PAW processes. The effect on carbon steel in the GMAW / MAG modality is little studied. Even in small amounts, active flux has improved the chemical composition of the solder by adding the silicon (Si) and / or manganese (Mn) deoxidizer. The material in active flux of the research has a composition of 1.17% of silica (SiO2), without manganese registration, predominantly of titanium oxide (TiO2) and calcium oxide (CaO). In this work, from the application of an oxidized composition in sheet steel ASTM A36, welding in Bead on Plate (BOP), in the short-circuit GMAW / MAG process, and 100% CO2 gas protection. Thus, an analysis of the effect of the active flux on the chemical composition of the zone of fusion (ZF), cord geometry and mechanical properties of the weld bead was sought. The effect on the chemical composition of the melting pool consisted of a reduction in aluminum concentration (Al), increase in silicon composition (Si) and higher retention of manganese (Mn) in the melting zone (ZF). The geometric parameters were reduced, the hardness distribution on the face of the weld showed a small increase, due to the use of active flow. The samples were compared with a conventional weld at lower protection gas flow. Statistical analysis in factorial planning gives optimal process values in better performance.