Per: ana paola villalva braga (INSTITUTO DE PESQUISAS TECNOLÓGICAS), LEONARDO RODRIGUES DANNINGER (escola politécnica da usp), dany michell andrade centeno (instituto de pesquisas tecnológicas), cesar roberto de farias azevedo (escola politecnica da usp)
Abstract:
In the Friction Stir Welding process (FSW), the base material is not melted, so some problems usually associated with welding processes, such as hot cracks and porosity, are avoided. However, the FSW introduces plastic deformation and heating into the base metal. This work aims to evaluate the microstructural and mechanical properties impacts of the FSW process on a wrought Al-Mg-Si alloy (AA6005A-T6) and compare with the literature results. The samples were characterized using light microscopy, tomography, hardness, tensile and fatigue testing. The results revealed four distinct microstructures (NZ, TMAZ, HAZ, and BM) and an asymmetrical hardness gradient profile. The tensile tests indicate that the yield and tensile strengths and ductility are compatible with the literature. The FSW process promoted plastic deformation and localized temperature rise, which caused recrystallization and grain growth in some areas, affecting the mechanical properties. The localized reduction in the mechanical properties in the joint agrees with the literature.