Mestrado em Engenharia de Produção

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Navegando Mestrado em Engenharia de Produção por Autor "Azevedo, Sarah Cristina"

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    Avaliação de aspectos operacionais do processo de soldagem TIG-MIG/MAG
    (Universidade Federal de Goiás, 2019-03-12) Azevedo, Sarah Cristina; Resende, André Alves de; http://lattes.cnpq.br/3492793149542286; Resende, André Alves de; Duarte, Carlos Antônio Ribeiro; Reis, Ruham Pablo
    In the search for productivity gains and cost reduction, the optimization of welding processes has been presented as an opportunity for the industries of the metal-mechanic sector. In this context, the so-called "Hybrid Welding Processes", in which two or more conventional processes are combined, have gained prominence. Among these, TIG-MIG / MAG has shown itself to be an alternative, mainly because it associates processes already traditionally known and used in the market. Thus, the general objective of the present work is to analyze the influence of the TIG-MIG / MAG process variables on the weld bead geometry obtained. For this purpose, welds of simple deposition on sheet were performed, varying the TIG current, the TIG torch angle, the MIG / MAG torch angle and the distance between the electrodes. Then, tests were performed by varying the current circuit of the TIG and MIG / MAG process. As main results, for the set of evaluated parameters, it was verified that it is possible to act on the weld bead geometry, varying the positioning parameters and the TIG and MIG / MAG current. Greater melt and penetration area achieved with TIG torch angle and MIG / MAG torch angle, maximum values and the distance between the electrodes in the minimum value. Inserting the current into the TIG circuit contributes to a greater melt area and greater penetration. A greater width is obtained by using the TIG torch angle and the MIG / MAG torch angle in the minimum values and the distance between electrodes, in the maximum values, in this sense, the insertion of the current in the TIG circuit increases the width. The greatest reinforcement is obtained by using the TIG torch angle and the MIG / MAG torch angle at the maximum values and the minimum electrode distance. Already when the current is inserted in the TIG circuit, there is a decrease in the values of the reinforcement. Finally, a greater angle of convexity was achieved by using the torch angles at the maximum values, and with the insertion of the current in the TIG circuit, there was a decrease in the convexity angle values.