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Fatigue life data and failure probability assessments in these types of joints,fabricated from duplex stainless steel 2205, are comparatively scarce and, therefore, aresearch study was initiated to assess the fatigue behaviour of load carrying joints of thismaterial and to obtain probability of failure data using the methods of ProbabilisticFracture Mechanics (PFM). Probability of failure results was obtained both for thesituations of unstable fracture and fatigue crack growth. For fatigue crack growth, theparameters used were the design stresses for three values of fatigue life (105, 2x106 and 107cycles), using design curves of two codes, and also experimental S-N curve obtained by theauthors in the duplex 2205 material and corresponding to the lower fatigue curve for 95%confidence interval. The K solutions were 2dFE J integral analysis, obtained by theauthors, and the BS7910 formulation. Sensitivity analysis of the probability of failureresults is presented in the paper.