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<p>This study involved the repair of a friction stir welded aluminum alloy 6082T6 joint using the cold metal transfer (CMT) process. Through the examination of microstructure, hardness, tensile, and bending properties, the effects of the CMT welding process on the metallurgical and mechanical properties of the repair joint were evaluated. The repaired weld metal exhibited columnar structures&#xa0;at the weld edge and equiaxed dendritic structures with notable dispersed porosities. The overall hardness of the CMT repair joint is better than that of the original friction stir welding (FSW) joint. The tensile strength of the repair joint was approximately 97% of that of the original FSW joint. The tensile fracture of the original FSW joint occurred at the thermo-mechanically affected zone (TMAZ) of the retreating side; however, upon repair, the tensile fracture of the repaired joint took place at the TMAZ of the advancing side. While original FSW welds were slightly stronger, CMT repairs showed comparable bending performance. The repair joint achieved 91% and 96% of the original face and root bending strengths, respectively. The porosity found in the repair weld did not influence the mechanical qualities of the joint. The results for tensile strength and hardness are consistent. The tensile fracture was in the region of lowest hardness. The overall results demonstrate that the FSW-welded AA6082T6 joint can be efficiently repaired using the CMT welding process.</p>

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Repairing of friction stir–welded 6082T6 aluminum alloy through pulsed cold metal transfer welding process

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Muhamad Tehyo,
  • Thanate Ratanawilai,
  • Hein Zaw Oo,
  • Prapas Muangjunburee

摘要

This study involved the repair of a friction stir welded aluminum alloy 6082T6 joint using the cold metal transfer (CMT) process. Through the examination of microstructure, hardness, tensile, and bending properties, the effects of the CMT welding process on the metallurgical and mechanical properties of the repair joint were evaluated. The repaired weld metal exhibited columnar structures at the weld edge and equiaxed dendritic structures with notable dispersed porosities. The overall hardness of the CMT repair joint is better than that of the original friction stir welding (FSW) joint. The tensile strength of the repair joint was approximately 97% of that of the original FSW joint. The tensile fracture of the original FSW joint occurred at the thermo-mechanically affected zone (TMAZ) of the retreating side; however, upon repair, the tensile fracture of the repaired joint took place at the TMAZ of the advancing side. While original FSW welds were slightly stronger, CMT repairs showed comparable bending performance. The repair joint achieved 91% and 96% of the original face and root bending strengths, respectively. The porosity found in the repair weld did not influence the mechanical qualities of the joint. The results for tensile strength and hardness are consistent. The tensile fracture was in the region of lowest hardness. The overall results demonstrate that the FSW-welded AA6082T6 joint can be efficiently repaired using the CMT welding process.