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<p>Many studies have established a link between the&#xa0;geometrical quality of a weld bead and its fatigue life and have shown that a large weld toe radius improves fatigue resistance, but the radius of the weld represents a key issue. The use of digitised measurements based on laser profilometry has made it possible to assess the quality of the weld toe radius and led to interest in using the stress concentration factor to better estimate&#xa0;the fatigue life. The aim of this study is to evaluate the effect of the ground weld toe on the fatigue resistance of cruciform joints depending on the steel grade used and the thickness. Fatigue tests were performed under tension (<i>R</i> = 0.5) on as-welded and ground weld toe cruciform joints with steel grades S355 and S690 and thicknesses of 10&#xa0;mm and 20&#xa0;mm. The radius associated with each configuration was assessed via laser profile scanning. The fatigue results revealed an increase in the fatigue strength with increasing weld toe radius as well as increasing steel grade yield strength. In contrast, increasing the thickness decreases the fatigue resistance of cruciform joints with as-welded or ground weld toes.</p>

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Influence of the ground weld toe on the fatigue resistance of S355 and S690 10 mm and 20 mm cruciform joints

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Lauriane Guilmois,
  • Romain Cuinat,
  • Robin Hauteville,
  • Laurent Jubin,
  • Isabel Huther,
  • Fabien Lefebvre

摘要

Many studies have established a link between the geometrical quality of a weld bead and its fatigue life and have shown that a large weld toe radius improves fatigue resistance, but the radius of the weld represents a key issue. The use of digitised measurements based on laser profilometry has made it possible to assess the quality of the weld toe radius and led to interest in using the stress concentration factor to better estimate the fatigue life. The aim of this study is to evaluate the effect of the ground weld toe on the fatigue resistance of cruciform joints depending on the steel grade used and the thickness. Fatigue tests were performed under tension (R = 0.5) on as-welded and ground weld toe cruciform joints with steel grades S355 and S690 and thicknesses of 10 mm and 20 mm. The radius associated with each configuration was assessed via laser profile scanning. The fatigue results revealed an increase in the fatigue strength with increasing weld toe radius as well as increasing steel grade yield strength. In contrast, increasing the thickness decreases the fatigue resistance of cruciform joints with as-welded or ground weld toes.