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The present work explored the impact of friction stir processing (FSP) on tungsten inert gas (TIG) welds of AA6061 and AA7075 alloys using two tool pin geometries: straight cylindrical (SCY) and cylindrical threaded with three flat faces (THF). The metallurgical features of both TIG and TIG + FSP welds were investigated and correlated with microhardness and wear resistance properties. Results illustrated that the TIG weld showed coarse dendritic structures, while post-FSP converted these coarse grain structures into fine and equiaxed grain structures. The average grain size (AGS) values for TIG welds were found to be 36.51 µm, whereas, for TIG + FSP welds, it was measured at 3.74 µm for the THF pin. Applying FSP to the TIG welds led to a significant enhancement in the microhardness and wear resistance properties. In particular, the microhardness saw a remarkable increase of 76.56%, while the wear rate experienced a notable decrease of 37.78%.

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Tribological Behavior of Friction Stir Processed Dissimilar Aluminum Joints

  • 会议论文

  • 发表日期：

    2025年

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  • Md Saquib Bin Reyaz,
  • Amar Nath Sinha

摘要

The present work explored the impact of friction stir processing (FSP) on tungsten inert gas (TIG) welds of AA6061 and AA7075 alloys using two tool pin geometries: straight cylindrical (SCY) and cylindrical threaded with three flat faces (THF). The metallurgical features of both TIG and TIG + FSP welds were investigated and correlated with microhardness and wear resistance properties. Results illustrated that the TIG weld showed coarse dendritic structures, while post-FSP converted these coarse grain structures into fine and equiaxed grain structures. The average grain size (AGS) values for TIG welds were found to be 36.51 µm, whereas, for TIG + FSP welds, it was measured at 3.74 µm for the THF pin. Applying FSP to the TIG welds led to a significant enhancement in the microhardness and wear resistance properties. In particular, the microhardness saw a remarkable increase of 76.56%, while the wear rate experienced a notable decrease of 37.78%.