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Material-flow behavior during friction-stir welding of 6082-T6 aluminum alloy

Abstract

Material-flow behavior during friction-stir welding of 6082-T6 aluminum alloy has been visualized by marker insert technique. Four stacked layers were evolved in welding nugget zone (WNZ) in the transverse section. The material-flow behavior in vertical direction was detected by observing the distribution of Cu foil fragments and Al-Cu intermetallic compounds. The downward and upward flows encounter each other at the advancing side in the material depositing process, changing the morphology of WNZ. A conceptual balanced-flow model and a plastic material-flow model were used to describe the material-flow behavior, and the origin of the downward material flow in the advancing side was discussed. The excess-material flow derived by the welding tool due to the existence of the tilt angle is crucial to the weld formation.

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Correspondence to Yongxian Huang.

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Huang, Y., Wang, Y., Wan, L. et al. Material-flow behavior during friction-stir welding of 6082-T6 aluminum alloy. Int J Adv Manuf Technol 87, 1115–1123 (2016). https://doi.org/10.1007/s00170-016-8603-7

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Keywords

  • Friction-stir welding
  • Aluminum alloy
  • Marker material
  • Material-flow behavior
  • Welding nugget zone