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The present paper is concerned with the use of the Modified Wöhler Curve Method to estimatefatigue lifetime of thin welded joints of both steel and aluminium subjected to in-phase and out-of-phasemultiaxial fatigue loading. The most important peculiarity of the above multiaxial fatigue criterion is that it canbe applied by performing the stress analysis in terms of both nominal and local quantities, where in the lattercase the relevant stress state at the assumed critical locations can be estimated according to either the referenceradius concept or the Theory of Critical Distances. The accuracy and reliability of our multiaxial fatigue criterionwas systematically checked through several experimental results taken from the literature and generated bytesting, under in-phase and out-of-phase biaxial loading, welded joints of both steel and aluminium havingthickness of the main tube lower than 5 mm.