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This research investigated the impact of friction stir processing (FSP) using two tool pin shapes on the metallurgical features of the tungsten inert gas (TIG) welds of AA6061 and AA7075 alloys. Two tool pin geometries such as straight cylindrical (SCY) and cylindrical threaded with three flat faces (THF) were utilized during FSP. The weld fabricated using the THF pin had smaller grains in comparison to the SCY pin. The tensile, elongation, and flexural properties of the weld produced with THF were higher compared to those produced using SCY. The TIG + FSP weld fabricated with THF pin produced the highest ultimate tensile strength (UTS) of about 265 MPa, tensile elongation (TE) of 15.7%, and ultimate flexural strength (UFS) of 295 MPa, while the TIG weld had the lowest UTS of 156 MPa, TE of 8.1%, and UFS of 181 MPa. Because of the larger dimples and macro-voids, TIG welds experienced brittle failure, while TIG + FSP welds exhibited ductile fracture due to finer and more uniform dimples.

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Friction Stir Processing of Tungsten Inert Gas Welds of AA6061 and AA7075 Alloys Using Different Tools

  • 会议论文

  • 发表日期：

    2025年

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  • Md Saquib Bin Reyaz,
  • Amar Nath Sinha

摘要

This research investigated the impact of friction stir processing (FSP) using two tool pin shapes on the metallurgical features of the tungsten inert gas (TIG) welds of AA6061 and AA7075 alloys. Two tool pin geometries such as straight cylindrical (SCY) and cylindrical threaded with three flat faces (THF) were utilized during FSP. The weld fabricated using the THF pin had smaller grains in comparison to the SCY pin. The tensile, elongation, and flexural properties of the weld produced with THF were higher compared to those produced using SCY. The TIG + FSP weld fabricated with THF pin produced the highest ultimate tensile strength (UTS) of about 265 MPa, tensile elongation (TE) of 15.7%, and ultimate flexural strength (UFS) of 295 MPa, while the TIG weld had the lowest UTS of 156 MPa, TE of 8.1%, and UFS of 181 MPa. Because of the larger dimples and macro-voids, TIG welds experienced brittle failure, while TIG + FSP welds exhibited ductile fracture due to finer and more uniform dimples.