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Authors
Advisor(s)
Abstract(s)
A utilização do processo de soldadura em escala industrial tornou-se expressiva com o passar dos anos e, atualmente, está entre os principais processos de união de materiais metálicos. Ao longo da soldadura ocorrem alterações estruturais e metalúrgicas nas proximidades da junta. As tensões térmicas e distorções geométricas são majoritariamente indesejáveis e complexas de serem previstas com precisão. Utilizando como material de base o aço S235JR, realizou-se experimentos laboratoriais por meio do processo GMAW com diferentes sequências de soldadura, tendo como o objetivo a investigação da influência da direção e do sentido nas distorções dos provetes. Para a aferição das distorções, aplicou-se uma metodologia utilizando equipamentos de identificação das coordenadas no espaço operacional com precisão metrológica e posteriormente aplicou-se uma segunda metodologia por meio de equipamentos analógicos com o objetivo de compará-las e verificar a eficiência das metodologias. Por meio das análises metrológicas e estatísticas, constatou-se que a direção de soldadura foi um fator significativo para a soldadura sobre chapas, enquanto para as soldaduras em juntas de topo o fator sentido mostrou-se influenciar significativamente as distorções finais. Como resultado da comparação entre as metodologias, ambas as obtiveram resultados semelhantes e provaram ser eficazes em identificar os padrões de distorções.
The use of the welding procedure in an industrial scale has become expressive over the years and currently is between the main joining processes. Along the welding occurs structural and metallurgical changes nearby the joint. The thermal stresses and geometrical distortions are mostly undesirable and complicated to be precisely foreseen. Using as a base material the S235JR steel, were performed laboratory experiments by GMAW process with different welding sequences, having as an aim the investigation of the influence of direction and orientation in the distortion of the samples. For the measurement of the distortions, it was applied a methodology using equipment to identify the coordinates in the operational space with metrological precision and posteriorly it was applied a second methodology through analogical equipment with the aim of making their comparison and to verify the efficiency of the methodologies. Through metrological and statistical analysis, it was found that the welding direction was a sicnificant factor for the bead-on-plate welding, while for the butt welding, the orientation factor was shown to significantly influence the final distortions. As a result of the comparison between the methodologies, both obtained similar results and proved to be effective in identifying the patterns of distortions.
The use of the welding procedure in an industrial scale has become expressive over the years and currently is between the main joining processes. Along the welding occurs structural and metallurgical changes nearby the joint. The thermal stresses and geometrical distortions are mostly undesirable and complicated to be precisely foreseen. Using as a base material the S235JR steel, were performed laboratory experiments by GMAW process with different welding sequences, having as an aim the investigation of the influence of direction and orientation in the distortion of the samples. For the measurement of the distortions, it was applied a methodology using equipment to identify the coordinates in the operational space with metrological precision and posteriorly it was applied a second methodology through analogical equipment with the aim of making their comparison and to verify the efficiency of the methodologies. Through metrological and statistical analysis, it was found that the welding direction was a sicnificant factor for the bead-on-plate welding, while for the butt welding, the orientation factor was shown to significantly influence the final distortions. As a result of the comparison between the methodologies, both obtained similar results and proved to be effective in identifying the patterns of distortions.
Description
Mestrado de dupla diplomação com o Centro Federal de Educação Tecnológica de Minas Gerais
Keywords
Processo GMAW Soldaduras