Application of local approaches to the assessment of fatigue test results obtained for welded joints at sub-zero temperatures

[Display omitted] •Analysis of fatigue strength data for temperatures ranging from 20 °C to −50 °C.•Comparison of weld toe and root failure assessment methods at sub-zero temperatures.•Modification factors for local fatigue assessment methods for sub-zero temperatures. Several studies have found significant increase in the fatigue strength of welded joints of structural steels at sub-zero temperatures. This study addresses the research by investigating the applicability of local fatigue assessment methods to welded joints exposed to sub-zero temperatures. For this purpose, fatigue test results of two fillet weld details with weld toe and weld root failure are evaluated at a range of temperatures using a variety of structural hot-spot and notch stress approaches, then are compared to the nominal stress approach. Large differences in prediction accuracy are found for the analysed assessment methods and both failure locations.