Finite element analysis reveals fracture parameters in X80 steel T-joints under stress conditions, indicating critical welding weaknesses.
Oil and gas pipeline construction has been experienced for more than 200 years. With the development of the world economy, the demand for oil and natural gas is increasing. X80 steel is a kind of high-strength pipeline steel widely used in pipeline engineering at present. Pipeline steel is developed by adding a small amount of alloying elements and improving the rolling process under the low C-Mn-Si system. In this paper, the X80 steel T-joint is taken as the research object, the finite element simulation is used to analyze the fracture of the T-joint, and the change law of the fracture parameters of the crack tip under different stress states is studied. The research shows that the welding crack at the fusion line (FL) is the most dangerous, which can provide a certain reference for pipeline engineering.
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Tian et al. (2025) studied this question.
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