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<p>In this work, forming behavior of friction stir tailor-welded (FSTWed) dissimilar AA7075-T6 and AA5083-O sheets subjected to W-tempering is studied. The best FSTW condition for these 1.5&#xa0;mm sheets considering higher values of UTS and limiting dome heights (LDHs) was obtained for a tool speed of 50&#xa0;mm/min and 1200 RPM. The W-tempered FSTW (WT-FSTW) blanks showed 27% higher LDH with more uniform thickness and strain distribution pattern. The FE generated data by combination blank (individual modeling of base sheets and weldment) method considering isotropic hardening showed reasonable, but over-predicted thickness and strain distribution trends at similar LDH as that&#xa0;of experiments. A visible reduction in hardness (VHN) recorded for WT-FSTW showed softening of AA7075 side which complemented with softer AA5083 to improve the deformation behavior. Also, the SEM images of LDH fracture location showed an increased dispersion of dimples which substantiated an increase in ductility, and hence higher formability of WT-FSTW blanks.</p>

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Effect of W-Tempering on the Formability of Dissimilar Friction Stir Tailor-Welded AA7075/AA5083 Sheets

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Ajin Elias Alex,
  • Rushil Ratnakar Rao,
  • Bhupesh Singh Katiyar,
  • Sudhy S. Panicker

摘要

In this work, forming behavior of friction stir tailor-welded (FSTWed) dissimilar AA7075-T6 and AA5083-O sheets subjected to W-tempering is studied. The best FSTW condition for these 1.5 mm sheets considering higher values of UTS and limiting dome heights (LDHs) was obtained for a tool speed of 50 mm/min and 1200 RPM. The W-tempered FSTW (WT-FSTW) blanks showed 27% higher LDH with more uniform thickness and strain distribution pattern. The FE generated data by combination blank (individual modeling of base sheets and weldment) method considering isotropic hardening showed reasonable, but over-predicted thickness and strain distribution trends at similar LDH as that of experiments. A visible reduction in hardness (VHN) recorded for WT-FSTW showed softening of AA7075 side which complemented with softer AA5083 to improve the deformation behavior. Also, the SEM images of LDH fracture location showed an increased dispersion of dimples which substantiated an increase in ductility, and hence higher formability of WT-FSTW blanks.