The work deals with the study of the reliability of welded joints of pipeline systems, provided that there are various types of defects in the welds: external undercuts, internal undercuts, pores. Finite element modeling of welded joints was performed and the intensity of operating stresses was calculated using the Ansys application software package. Stress concentration coefficients are calculated and the probability of trouble-free operation of welded joints in the presence of the considered defects is estimated. The data obtained can be used in the design and optimization of pipeline system elements.

Keywords: modeling, reliability indicators, welded joint of piping systems