Forming limit analysis of friction stir tailor welded AA5083 and AA7075 sheets in single point incremental forming
Source abstract
Abstract
Formability of friction stir welded dissimilar aluminium alloy sheets namely AA5083 and AA7075 in single point incremental forming (SPIF) is investigated in this article. Initially friction stir tailor welded blanks (FS-TWB) were made by varying different process parameters such as tool shoulder diameter, welding speed, and tool rotational speed following a central composite experimental design. A combination of lower rotational speed, higher weld speed and a moderate tool shoulder diameter was found to produce optimal weld quality in terms of ultimate tensile strength (UTS) and percentage elongation (PE) obtained through response surface method. Deformation instability method and incremental sheet forming tests were employed to predict forming limit curve (FLC) and maximum formable wall angle for the FS-TWBs with optimal weld quality. Formability of FS-TWBs were seen to be comparable to that of the base sheet materials. Formability of the incrementally formed FS-TWB could be attributed to the microstructures of the deformed welded zone containing varying grain sizes effected by severe plastic deformation and dynamic recrystallization. Fracture morphology revealed that forming fracture strains limited by the combined modes of ductile and brittle modes fractures in FS-TWB during SPIF.
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Research context
OpenAlex topics: Metal Forming Simulation Techniques · Advanced Welding Techniques Analysis · Metallurgy and Material Forming
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (40)
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