COMPOSITION OF RUST LAYER AND FATIGUE STRENGTH OF WEATHERING STEEL WELDED JOINTS WEATHERED FOR 41 YEARS

DOI Web Site 7 References
  • KINOSHITA Koji
    岐阜大学 工学部社会基盤工学科
  • SAKURAI Yuta
    瀧上工業株式会社 技術本部技術企画グループ
  • BAMBA Rie
    岐阜大学大学院 自然科学技術研究科環境社会基盤工学専攻
  • HASUIKE Rina
    山口大学大学院 創成科学研究科工学系学域社会建設工学分野
  • ONO Yuki
    岐阜大学 工学部社会基盤工学科

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Other Title
  • 41年間大気暴露された耐候性鋼溶接継手のさび組成と疲労強度

Abstract

<p> Many weathering steel bridges have been in service for more than 40 years, and therefore, it is necessary to clarify the fatigue strength of the weathering steel welding joints that have the protective rust layer. This study included corrosion property measurements, rust composition analyses, and fatigue tests of weathering steel welded joints that have been exposed to the atmosphere environment for 41 years. The rust layer thickness, corrosion pit depth, and weld toe radius tended to be similar to or relatively increase from those in the results of a study conducted after 25 years of exposure. Based on the rust composition, the presence of the protective rust layer in which the α-FeOOH layer was distributed near the interface with the steel surface was confirmed. The fatigue strength tended to be about the same as or larger than that after 25 years of exposure. Thus, the fatigue strength has been kept due to the corrosion reduction of corrosion progress by the protective rust that has been maintained after 25 years. In addition, a visual inspection and magnetic particle testing were conducted from the surface over the rust layer. Detecting the early stage of crack initiation was difficult due to the rust over the crack, but the crack became detectable after it had propagated up to certain lengths.</p>

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