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Advisor(s)
Abstract(s)
A soldadura apresenta-se como um dos processos de união de materiais mais versáteis e eficientes que existem na indústria, podendo ser utilizado em uma vasta gama de materiais, espessuras e aplicações. A correta seleção dos parâmetros de soldadura é primordial na qualidade do cordão final, garantindo a maior eficiência do processo. O objetivo deste presente trabalho é otimizar os parâmetros de soldadura para uma determinada qualidade final do processo. Os parâmetros considerados para esta análise foram a tensão, velocidade de soldadura e o ângulo da tocha. As características de qualidade a controlar são a penetração, a largura, o reforço do cordão de solda e o limite de resistência à tração. Para esta otimização foram utilizados dois métodos. O método Taguchi para a definição das matrizes ortogonais que possibilitam o estudo dos fatores selecionados com um número reduzido de experimentos. Para este trabalho, foi criada uma matriz do tipo L9, com os três parâmetros com três níveis para cada. O outro método utilizado foi a análise relacional de Grey, que combina o resultado para várias respostas em apenas um único valor, que é o grau relacional de Grey. Por fim, foi utilizada a análise de variância (ANOVA) para avaliar o quanto cada parâmetro contribui no resultado. A combinação ótima obtida para os objetivos determinados foi: tensão 23,7 V, velocidade de soldadura 250 mm/min e ângulo da tocha 0º. Após a utilização da análise relacional de Grey, foram realizados experimentos de confirmação, utilizando a combinação ótima, que melhoraram o valor do grau relacional de Grey em 13,09%. Com a utilização da ANOVA, verificou-se que a velocidade de soldadura é o parâmetro que apresenta maior contribuição para o resultado final com 21,73%, o ângulo da tocha teve contribuição de 21,34% e a tensão 19,57%.
Welding is one of the most versatile and efficient materials joining processes in the industry and can be used in a wide range of materials, thicknesses, and applications. The correct selection of the welding parameters is crucial in the quality of the weld bead, ensuring greater process efficiency. The aim of this work is to optimize the welding parameters for a certain final process quality. The parameters considered for this analysis were voltage, welding speed and torch angle. And the quality characteristics are penetration, width, and reinforcement of the weld bead as the tensile strength. For this optimization, two methods were used. The Taguchi method allows to design an orthogonal array that enable the study of the selected factors with a reduced number of experiments. By this method, a L9 orthogonal array was created, with the three parameters at three levels each. The other method used was Grey Relational Analysis, which combines the result for multi responses into a single value, Grey relational grade. Finally, the analysis of variance (ANOVA) was used to evaluate how much each parameter contributes to the result. The optimal combination obtained for the previously determined objectives was voltage at 23,7 V, welding speed at 250 mm/min and torch angle at 0º. After the use of Grey Relational Analysis, confirmatory experiments were performed, using optimal combination, which improved the value of Grey relational grade by 13,09%. With the use of ANOVA, it was verified that the welding speed is the parameter that presents the greatest contribution to the result with 21,73%, the torch angle had contribution of 21,34% and the voltage 19,57%.
Welding is one of the most versatile and efficient materials joining processes in the industry and can be used in a wide range of materials, thicknesses, and applications. The correct selection of the welding parameters is crucial in the quality of the weld bead, ensuring greater process efficiency. The aim of this work is to optimize the welding parameters for a certain final process quality. The parameters considered for this analysis were voltage, welding speed and torch angle. And the quality characteristics are penetration, width, and reinforcement of the weld bead as the tensile strength. For this optimization, two methods were used. The Taguchi method allows to design an orthogonal array that enable the study of the selected factors with a reduced number of experiments. By this method, a L9 orthogonal array was created, with the three parameters at three levels each. The other method used was Grey Relational Analysis, which combines the result for multi responses into a single value, Grey relational grade. Finally, the analysis of variance (ANOVA) was used to evaluate how much each parameter contributes to the result. The optimal combination obtained for the previously determined objectives was voltage at 23,7 V, welding speed at 250 mm/min and torch angle at 0º. After the use of Grey Relational Analysis, confirmatory experiments were performed, using optimal combination, which improved the value of Grey relational grade by 13,09%. With the use of ANOVA, it was verified that the welding speed is the parameter that presents the greatest contribution to the result with 21,73%, the torch angle had contribution of 21,34% and the voltage 19,57%.
Description
Mestrado de dupla diplomação com o Centro Federal de Educação Tecnológica de Minas Gerais – CEFET-MG
Keywords
GMAW Otimização Taguchi Grey