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Abstract 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.
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2011, 
