2022-01-062022-01-062020-12-21SILVA, João Guilherme Ferreira. Estudo da influência do gás de proteção da soldagem MIG/MAG na resistência mecânica de uma junta. 2020. 74 f. Trabalho de Conclusão de Curso (Graduação) - Escola de Engenharia Elétrica, Mecânica e de Computação, Universidade Federal de Goiás, Goiânia, 2020.http://repositorio.bc.ufg.br/handle/ri/20127The influence of shielding gas on the mechanical properties of a welded joint made of carbon steel is the object of study in this work. Considering that, today, most of the processes involving MIG/MAG welding are done using gas mixtures based on Argon, which has an average cost per cubic meter 80% higher when compared to Pure Carbon Dioxide (CO2) and the theme is little explored in the scientific community, a study was carried out to verify the feasibility of applying Pure Carbon Dioxide (CO2) as a shielding gas. To carry out this study, two types of shielding gas available on the market were used: Pure Carbon Dioxide (CO2) and the mixture Ar + 25% CO2. The base metal used was structural carbon steel of ASTM-A36 classification and the addition metal was ER70S-6 classification wire. The transfer method used was by short-circuit. The results of this study showed that Pure Carbon Dioxide (CO2) has less stability during welding, with the formation of splatters and lower quality of the weld bead, being more susceptible to the formation of porosity when compared to the mixture Ar + 25% CO2, using the same parameters. The macrographic characterization of the processes was done through optical microscopy. The mechanical properties raised were microhardness and tensile strength. Although the mixture Ar + 25% CO2 has better properties, welding with Pure Carbon Dioxide (CO2) proved to be possible, requiring the adequacy of all welding parameters in order to obtain a satisfactory final result.porAcesso AbertoMIG/MAGGás de ProteçãoDióxido de Carbono Puro (CO2)Ar + 25% CO2Propriedades mecânicasShielding gasPure Carbon Dioxide (CO2)Ar + 25% CO2Mechanical propertiesTCC