Safe assessment for undermatched welded joint of pipeline;

Finite element calculation and regression analysis on stress concentration factors of undermatching butt joints;

Unfortunately, however load-carrying capacity of undermatching weld joints is lower than the one of equalmatching weld joints.

The undermatching design of joints could decrease the tendency of the cold cracking and the preheating temperature or no-preheating, but the bearing capacity decreases in some extent.

After the detailed research on above-mentioned constraints and based on the high-low matching and conversion of unit coal consumption rates,an energy conservation dispatching model for regional power network and corresponding algorithm are given.

Appraisement on the load-bearing ability of undermatching welded joint using slip line field method;