Abstract
Friction Stir Processing (FSP) is a relatively new post-processing technique. Fatigue strength of MIG fillet welds of aluminium alloys can be substantially improved using FSP. Beyond other properties intrinsically tied to fatigue life, especially attention should be paid to the effect of the final residual stress state. In this study the residual stress distribution in T-joints of two aluminium alloys was determined by Neutron and X-ray diffraction. FSP effect on the residual stress state and fatigue life was analysed.
Highlights
Friction Stir Processing (FSP) is an emerging metalworking technique that can provide localized modification and control of microstructures in near-surface layers of processed metallic components
In the results presented in the following, only the residual stresses in the cross direction to the welding beads will be considered
Below the weld bead the residual stress after MIG welding process is high tensile with values above 120 MPa, not seen in Fig 3, while in the case of Al5083 the value is high compressive with a value around -120 MPa
Summary
Friction Stir Processing (FSP) is an emerging metalworking technique that can provide localized modification and control of microstructures in near-surface layers of processed metallic components. Fatigue strength of MIG fillet welds of aluminium alloys can be substantially improved using FSP. In this study the residual stress distribution in T-joints of two aluminium alloys was determined by Neutron and X-ray diffraction.
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