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Synopsis : The effects of material properties of steel sheet, such as mechanical properties, microstructure and chemical composition, on the fatigue limit of gas shielded metal arc welded (GMAW) joints were investigated. Axial tension fatigue tests were conducted to lap-fillet welded joints of seven different hot-rolled sheet steels. Followings are main results. ( 1 ) The fatigue limit of welded joints varies to large extent, depending on the steels tested. ( 2 ) The fatigue limit depends mainly on toe radius of weld bead, which determines the stress concentration factor of welds.And the fatigue limit of welded joint is slightly affected by the fatigue limit of base metal. ( 3 ) There is a close correlation between chemical compositions of base metal and the fatigue limit of welded joint. The increase of Si content improves the fatigue limit remarkably, because it enlarges the toe radius of weld.

Effects of Metallurgical Properties on Fatigue Limit of Arc-welded Sheet Steel