Mestrado em Engenharia de Produção

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Navegando Mestrado em Engenharia de Produção por Autor "Costa, Gabriella Cristina da Silva"

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    Avaliação de potencialidades do processo de soldagem TIG-MIG/MAG com variação de polaridade no eletrodo MIG/MAG
    (Universidade Federal de Goiás, 2019-07-15) Costa, Gabriella Cristina da Silva; Resende, André Alves de; http://lattes.cnpq.br/3492793149542286; Resende, André Alves de; Duarte, Carlos Antonio Ribeiro; Ferreira Filho, Demostenes
    This study proposes a contribution to the improvement of production processes through the study of hybrid welding processes. It aims to evaluate the effects provided by the association of two conventional welding processes on the behavior of the welding voltage and current signals, on the production capacity and on the geometry of the weld obtained. In this case, the arc welding processes TIG (Tungsten Inert Gas) and MIG/MAG (Metal Inert Gas / Metal Active Gas) are associated and give rise to the TIG-MIG/MAG process. The tests were performed following a factorial planning, through simple deposition in SAE 1020 steel plates of 6.35 mm thickness. Experiments were performed varying the polarity of the MIG/MAG part of the process and the current of the TIG part of the process. The data of the voltage and current signals of the TIG-MIG/MAG process demonstrated that at the moment of insertion of the MIG/MAG arc in the process, the signals realigned their intensities in order to stabilize the process. The productive capacity analysis showed that the TIG-MIG/MAG process with the MIG/MAG electrode in direct polarity has better rates of deposition and fusion, if compared with the results obtained for conventional polarity. Through the analysis of variance it was identified that MIG/MAG polarity is the most influential factor in the results of weld bead geometry. The TIG-MIG/MAG process with theMIG/MAG electrode in direct polarity can generate larger widths, penetrations and molten areas and smaller reinforcements when compared to the conventional MIG/MAG process in direct polarity, opening the possibility of welding in this polarity. And finally, the presence of the TIG arc was able to reduce the convexity of the weld beads, regardless of the polarity.