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<p>To this day, the structural strength of laser-welded joints of Al-Li alloys made with a fiber laser has not been thoroughly studied. In this research, high-strength laser-welded joints of Al-2.7Cu-1.8 alloy were obtained using a fiber laser followed by post-weld heat treatment. The laser-welding process parameters were optimized, including welding speed, radiation power, and location of the focal spot. In addition, the influence of these parameters on the microstructure of the welded joints has been studied. After welding, the welded joints were heat treated (PWHT) in two modes to achieve optimal mechanical properties. Changes in the structural and phase composition of the weld material before and after PWHT were examined using synchrotron diffraction and transmission electron microscopy. The obtained research results have shown that during laser welding, copper-containing phases formed at the boundary of dendrites in the weld material, which leads to a reduction in strength. The process of post-weld heat treatment (PWHT) has led to the restoration of the phase composition in the material of the weld. The cyclic (fatigue strength), dynamic (crack strength), and static (yield strength and ultimate tensile strength) properties of laser-welded joints after PWHT have been studied. It has been observed that PWHT using mode 1 allows to achieve maximum fatigue and dynamic properties, while PWHT using mode 2 results in achieving maximum static properties at various temperatures.</p>

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Effect single-stage and three-stage aging treatment on the microstructure, phase composition, and mechanical properties of laser-welded joint Al-Cu-Li alloy

  • 期刊论文

  • 发表日期：

    2025年3月22日

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  • Alexandr Malikov,
  • Maria Mironova,
  • Igor Vitoshkin,
  • Egor Beglyarov,
  • Ilya Gertsel,
  • Evgeniy Karpov,
  • Kirill Zakharchenko,
  • Alexey Zavyalov

摘要

To this day, the structural strength of laser-welded joints of Al-Li alloys made with a fiber laser has not been thoroughly studied. In this research, high-strength laser-welded joints of Al-2.7Cu-1.8 alloy were obtained using a fiber laser followed by post-weld heat treatment. The laser-welding process parameters were optimized, including welding speed, radiation power, and location of the focal spot. In addition, the influence of these parameters on the microstructure of the welded joints has been studied. After welding, the welded joints were heat treated (PWHT) in two modes to achieve optimal mechanical properties. Changes in the structural and phase composition of the weld material before and after PWHT were examined using synchrotron diffraction and transmission electron microscopy. The obtained research results have shown that during laser welding, copper-containing phases formed at the boundary of dendrites in the weld material, which leads to a reduction in strength. The process of post-weld heat treatment (PWHT) has led to the restoration of the phase composition in the material of the weld. The cyclic (fatigue strength), dynamic (crack strength), and static (yield strength and ultimate tensile strength) properties of laser-welded joints after PWHT have been studied. It has been observed that PWHT using mode 1 allows to achieve maximum fatigue and dynamic properties, while PWHT using mode 2 results in achieving maximum static properties at various temperatures.