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In this paper, stress concentrations occurring in welded joints were described. Methods of fatigue life determination in welded joints were presented. Moreover, the paper contains descriptions and methods for determining the notch effect coefficient K f . Curves presenting histories of the fatigue coefficient of the structural notch effect were plotted for a double-V butt weld and some selected steels, based on strain analysis.

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This article presents the research results regarding chosen surface roughness parameters after milling with a standard holder and a holder equipped with a special modified vibration damper. The experimental research was conducted on a novel research stand. Obtained results have confirmed a positive effect of the modified vibration damper on machined surface quality.