Influência da taxa de subida da corrente na regularidade do processo MIG/MAG por curto-circuito

• Autor(a) principal: Niz, Weslei Rodrigues
• Data de Publicação: 2023
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/12748
• topic: Indutância; Curto-circuito; Soldagem MIG/MAG; Regularidade; Inductance; Short circuit; MIG/MAG welding; Regularity; OUTROS

The present work investigates the effects of the current rise rate (power source inductance adjustment) on the regularity of the MIG/MAG welding process operating in short-circuit mode. For this, initially the adjustment of the inductive effect of the power source was varied, keeping the regulation voltage and the supply speed constant. Using a regularity index calculated from the current voltage signals, the best fit of the inductive effect was determined. Then, the value of the inductive effect (average rate of current rise) was fixed and the welding voltage was varied with the feed speed kept constant. All tests were performed with 3 shielding gases with different percentages of CO2 (100% Ar, Ar+25%CO2, 100% CO2). As a result of the data analysis, it was possible to find the range of values for the rate of rise of welding current and voltage where the process operates with greater regularity. Preliminary results show that shielding gas influences the correlation between welding voltage, current rise rate and process regularity. After finding the range of values where the process is more regular, experiments were carried out to try to relate regularity with the generation of spatter, the generation of spatter had a tendency contrary to that of regularity, the best performance was with 100% CO2, followed by 100% Ar and the worst mass yield were Ar + 25% CO2.