In its structural finite element analysis,it is necessary not only to accurately reflect the bolt pretightening force among the various components and the forces delivered by contact areas,which to enhance the accuracy of the Structure Analysis and Computation,but also to achieve relatively independent Analysis and Com.

This research measures the residual stress of high frequency electric resistant welded pipe using the central-hole method and analyses the transient state of deformation and residual stress of the weld with ANSYS nonlinear finite element program.