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<p>This study investigates the impact of applied acceleration on the microstructure, mechanical properties, and residual stress distribution of AA5083-H321 aluminum alloy during automated tungsten inert gas (ATIG) welding. In this regard, a vibrational table was designed and fabricated to transfer the acceleration generated by the vibration motor to the weld pool. The vibrating motor operates at a sub-resonance frequency to apply controlled acceleration to the welding zone. Results demonstrate that increasing acceleration during welding, due to better ventilation in the weld pool and local plastic deformation during solidification, decreased residual stress by approximately 30 %. Furthermore, by increasing acceleration, the morphology of α-Al grains changed from coarse dendritic grains to uniformly fine grains, which enhanced grain refinement. Consequently, this resulted in a tensile strength improvement of approximately 60 % compared to conventional welding. However, excessive acceleration induced disruption in the welding zone and diminished the mechanical properties.</p>

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Effect of sub-resonance vibration during the welding on the residual stress and mechanical properties of aluminum welded sheets

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Majid Oveisi,
  • Davood Akbari,
  • Abouzar Ebrahimi

摘要

This study investigates the impact of applied acceleration on the microstructure, mechanical properties, and residual stress distribution of AA5083-H321 aluminum alloy during automated tungsten inert gas (ATIG) welding. In this regard, a vibrational table was designed and fabricated to transfer the acceleration generated by the vibration motor to the weld pool. The vibrating motor operates at a sub-resonance frequency to apply controlled acceleration to the welding zone. Results demonstrate that increasing acceleration during welding, due to better ventilation in the weld pool and local plastic deformation during solidification, decreased residual stress by approximately 30 %. Furthermore, by increasing acceleration, the morphology of α-Al grains changed from coarse dendritic grains to uniformly fine grains, which enhanced grain refinement. Consequently, this resulted in a tensile strength improvement of approximately 60 % compared to conventional welding. However, excessive acceleration induced disruption in the welding zone and diminished the mechanical properties.