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<p>In this paper, friction stir welded (FSW) joints of Al-Zn-Mg-Cu alloys with different welding speeds were prepared. The influence of welding speed on the precipitates and mechanical properties was investigated. Experimental results revealed that the heat affected zone is the weak zone of the joints due to internal stresses and microstructure differentiation. The large heat input leads to dissolution of the fine η′ phase in thermo-mechanically affected zone at low welding speeds, low heat input cannot promote the transformation of the GP zone to the η′ phase at higher welding speeds, and the joints show the highest precipitate density and the smallest precipitate average size at 140&#xa0;mm/min, which significantly improves mechanical properties significantly.</p>

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Effect of Welding Speed on Precipitation and Mechanical Properties of Friction Stir Welded 7075 Aluminum Alloy

  • 期刊论文

  • 发表日期：

    2025年4月29日

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  • Fuqiang Guo,
  • Shuwei Duan,
  • Naihua Wang,
  • Yong Zou

摘要

In this paper, friction stir welded (FSW) joints of Al-Zn-Mg-Cu alloys with different welding speeds were prepared. The influence of welding speed on the precipitates and mechanical properties was investigated. Experimental results revealed that the heat affected zone is the weak zone of the joints due to internal stresses and microstructure differentiation. The large heat input leads to dissolution of the fine η′ phase in thermo-mechanically affected zone at low welding speeds, low heat input cannot promote the transformation of the GP zone to the η′ phase at higher welding speeds, and the joints show the highest precipitate density and the smallest precipitate average size at 140 mm/min, which significantly improves mechanical properties significantly.