  The stress analysis of pressurized circumferential pipe weldments under
steady state creep is considered. The creep response of the material is
governed by Norton's law. Numerical and analytical solutions are obtained by
means of perturbation method, the unperturbed solution corresponds to the
stress field in a homogeneous pipe. The correction terms are treated as
stresses defined with the help of an auxiliary linear elastic problem. Exact
expressions for jumps of hoop and radial stresses at the interface are
obtained. The proposed technique essentially simplifies parametric analysis of
multi-material components.
