Re-evaluation of weld root fatigue strength for load-carrying fillet welded joints using the notch stress concept

The re-evaluation of fatigue strength, applying nominal and notch stress concepts has been carried out, using extracted experimental fatigue data for load-carrying fillet welded joints failing from weld root. Various reference radii, including r(ref) = 1 mm, r(ref) = 0.5 mm, and r(ref) = 0.3 mm are applied to investigate an appropriate reference radius for assessing fatigue strength of weld root using the effective notch stress concept. In addition, a new FAT class with modified slope is proposed to improve the accuracy of the current recommended class for thin joints with r(ref) = 0.3 mm.

Automated summary

The re-evaluation of fatigue strength for load-carrying fillet welded joints failing from weld root was conducted, investigating different reference radii to assess the fatigue strength of weld root. A new FAT class with modified slope was proposed to enhance the accuracy of the current recommended class, particularly for thin joints with r(ref) = 0.3 mm.