APPLICATION OF BARKHAUSEN MAGNETIC NOISE FOR FRICTION STIR WELDED JOINTS CHARACTERIZATION

Ano: 2019

Instituições de ensino: Universidade Estadual Paulista "Júlio de Mesquita Filho", Universidade de São Paulo, Sulzer Pumps, Universidade Estadual de Campinas

Idioma: Ingles

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Resumo

Friction stir welding (FSW) is an alternative process of joining materials, characterized by high deformation forces and lower peaks of temperature when compared to fusion welding. The FSW produces a variety of microstructures due to a different amount of deformation and cooling rates during welding, producing a complex profile of residual stress. In this study, the main goal was to use the Magnetic Barkhausen Noise (MBN) technique, a non-destructive and qualitative method, to evaluate residual stress, hardness and microstructure along the FSWelded joint region. The material used was a 9.5 mm thick X80 steel plate, welded using a 300 rev?min-1 spindle speed and 100 mm?min-1 welding speed with a polycrystalline cubic boron nitride with tungsten-rhenium (PCBN-WRe) tool. The results show a good correlation with profiles of residual stress and hardness reported in the literature for this type of joints, as well as the differentiation of the microstructures through the different evaluated regions.

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