According to features of CP3 welded tubes

the tensile tests for parent metal and mixed metal including weld beam and heat-affected zone (HAZ) metal were carried out

and cross-sectional sample of mixed metal are used for measuring microhardness throughout weld zone and HAZ. Then on the basis of the iso-strain assumption and mixture laws

stress-strain relationships of parent metal

weld beam metal and heat-affected zone metal were obtained. Moreover

FE models for NC bending of welded tubes were established. Finally

laws of parameters on the bending of welded tubes were analyzed

and wall thickness distributions of three cross sections of deformed welded and seamless tubes were compared

then effects of weld beam on bending process of welded tubes were obtained.