Design of the Equal-Loading Butt Joint for CF62 Steel

Abstract:

High-strength steel is often used in the design and manufacture of the pressure vessel and the failure accident often happens in the weld area after used. CF62 is chosen in this paper which is the large-scale sphere steel for manufacture and the equal-loading butt joint of whose three different sizes are designed. The weld simulations of the equal-loading joints are made by 3D FEM, then the residual stress distributions and the influence of the thickness are analyzed in this paper. The results show that the equal-loading butt joint's weld toe is without stress concentration and the equal-loading butt joint can reduce the residual stress during the welding process. The thinner equal-loading butt joint has the lower residual stress. The joint designed by the equivalent Von Mises calculation has the lower stress than the one designed by the maximum stress calculation as well and the same as the weld toe's stress concentration. But the half reinforcement width of the maximum stress calculation butt joint is smaller than that of the equivalent Von Mises joint and whose welding electrode is economical, so the maximum stress equal-loading joint fits the engineering practical more.

• Periodical: Applied Mechanics and Materials (Volume 750)
• Pages: 330-338
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.750.330
• Online since: April 2015
• Authors: Yu Wen Qian, Jian Ping Zhao*
• Keywords: Equal-Loading Butt Joint, Finite Element, Residual Stress, Under-Matching, Weld Toe Stress Concentration

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