The main features of durability design of weld structures containing initia
l technological defects are considered. Among these features are: (1) struc
tural analysis of welded structures; (2) simulation of limit states and eva
luation of reliability of welds and, (3) optimisation and ensuring a given
reliability of structures. The main results of simulation are given for: fa
tigue curves, reliability functions, complete probabilistic life diagrams,
diagrams of defect standardisation and probabilistic durability surfaces.