Study on the Mechanical Behavior of Butt Welded Forged Flange with Neck

With the promotion of tube tower in transmission line, to improve processing efficiency and quality, the substitute of butt welded forged flanges for traditional flange is become the trend of future development. With solid elements and contact elements of the general-purpose finite element software ANSYS, this paper analyzes the mechanical characteristics of forged flanges with neck, summarizes characteristics of stress distribution of the flange and bolt group, and contrast the bolt axial force extracted with the test data by the true scale tower test, which proved that the analysis of the flange using solid elements and contact elements is feasible. Suggestion of measurement of flange force in the test is given according to the characteristics of the bolt force.