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<p>The investigation of corrosion fatigue in weathering steel is critical for ensuring structural safety, reliability, and extended service life in complex environments. To address the critical issue of reduced corrosion fatigue resistance in a welded joint of the weathering steel, this study applied laser surface remelting with varying powers to submerged arc welding joints of ASTM A588 Gr. B weathering steel. Results demonstrated that the joint treated with 700&#xa0;W LSR exhibited optimal corrosion resistance, with polarization resistance increasing from 1424 to 2346&#xa0;Ω/cm<sup>2</sup>. Under a 3.5 wt.% NaCl solution, stress ratio <i>R = − </i>1, 10&#xa0;Hz loading frequency, and 259&#xa0;MPa stress amplitude, the corrosion fatigue life of the LSR-treated joint increased by 75.4%, from 66,662 to 116,951 cycles, compared to the untreated joint. The enhanced performance was attributed to a refined heterogeneous surface structure with fine grains formed by LSR, which effectively inhibited corrosion fatigue crack propagation. This work provides essential experimental and theoretical insights for improving corrosion resistance and corrosion fatigue properties of weathering steel welded joints.</p>

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Microstructure and Corrosion Fatigue of a Weathering Steel Welded Joint Processed by a Laser Remelting

  • 期刊论文

  • 发表日期：

    2025年11月15日

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  • Jingyuan Tan,
  • Xiayang Yu,
  • Qi Wu,
  • Zhihui Zhu,
  • Qianshuo Feng,
  • Wenlong Wang,
  • Bingfeng Wang

摘要

The investigation of corrosion fatigue in weathering steel is critical for ensuring structural safety, reliability, and extended service life in complex environments. To address the critical issue of reduced corrosion fatigue resistance in a welded joint of the weathering steel, this study applied laser surface remelting with varying powers to submerged arc welding joints of ASTM A588 Gr. B weathering steel. Results demonstrated that the joint treated with 700 W LSR exhibited optimal corrosion resistance, with polarization resistance increasing from 1424 to 2346 Ω/cm2. Under a 3.5 wt.% NaCl solution, stress ratio R = − 1, 10 Hz loading frequency, and 259 MPa stress amplitude, the corrosion fatigue life of the LSR-treated joint increased by 75.4%, from 66,662 to 116,951 cycles, compared to the untreated joint. The enhanced performance was attributed to a refined heterogeneous surface structure with fine grains formed by LSR, which effectively inhibited corrosion fatigue crack propagation. This work provides essential experimental and theoretical insights for improving corrosion resistance and corrosion fatigue properties of weathering steel welded joints.