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<p>Laser shock peening (LSP) was applied to the surface of welded joints made of 7075 aluminum alloy to improve their tensile properties. The study investigated the influence of the impact energy of LSP on the residual stress, microstructure, and tensile behavior of the alloy. Results revealed grain refinement in the surface layer following LSP, with increased impact times leading to finer grains due to highly extensive plastic deformation. The surface residual stress of the welded specimens was measured by x-ray diffraction, their tensile properties were evaluated, and their fracture morphology was examined by scanning electron microscopy. Findings indicated that LSP had a more pronounced effect on the surface residual stresses perpendicular to the welding seam than those parallel to it, and the stress magnitude on the crown surface was greater than that on the root surface. Yield strength, ultimate tensile strength, and breaking strength were improved by 60, 32, and 50%, respectively. The enhanced strain hardening induced by LSP played a key role in improving strength-ductility synergy by increasing the strain hardening rate and delaying the onset of necking. Fractography analysis showed that the fracture modes of the peened specimens involved aggregated micropores and transgranular fracture.</p>

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Effect of Laser Shock Peening on the Stresses and Tensile Properties of Welded Joints Made of 7075 Aluminum Alloy for Folded Chairs

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • M. Q. Shen,
  • J. T. Wang,
  • Q. L. Kong,
  • C. Liu

摘要

Laser shock peening (LSP) was applied to the surface of welded joints made of 7075 aluminum alloy to improve their tensile properties. The study investigated the influence of the impact energy of LSP on the residual stress, microstructure, and tensile behavior of the alloy. Results revealed grain refinement in the surface layer following LSP, with increased impact times leading to finer grains due to highly extensive plastic deformation. The surface residual stress of the welded specimens was measured by x-ray diffraction, their tensile properties were evaluated, and their fracture morphology was examined by scanning electron microscopy. Findings indicated that LSP had a more pronounced effect on the surface residual stresses perpendicular to the welding seam than those parallel to it, and the stress magnitude on the crown surface was greater than that on the root surface. Yield strength, ultimate tensile strength, and breaking strength were improved by 60, 32, and 50%, respectively. The enhanced strain hardening induced by LSP played a key role in improving strength-ductility synergy by increasing the strain hardening rate and delaying the onset of necking. Fractography analysis showed that the fracture modes of the peened specimens involved aggregated micropores and transgranular fracture.