Stress corrosion sensitivity prediction method for shell-and-tube heat exchanger tube and tube plate welded joint

Abstract

The invention belongs to the technical field of welding materials, and relates to a stress corrosion sensitivity prediction method for a shell-and-tube heat exchanger tube and tube plate welded joint.The influence of cracks on welding residual stress redistribution is considered, the coincidence degree of a finite element simulation result of heat exchanger tube head stress distribution and actual component stress distribution is improved, and then the influence of crack defects on tube head stress concentration is accurately obtained. Electrochemical corrosion parameters of different areas are obtained through corrosion tests of different areas of a pipe and pipe plate welding joint. The method has the advantages that based on thermodynamic and electrochemical theories of materials, thestress corrosion sensitivity of the welded joint of the tube and the tube plate is predicted, the stress corrosion sensitivity of different parts is obtained, and the method has important theoreticalguiding significance and engineering application value for guaranteeing safe operation of the tube head of the heat exchanger.

Description

technical field [0001] The invention belongs to the technical field of welding materials and relates to the prediction of stress corrosion sensitivity of welding parts. Background technique [0002] The heat exchanger is a unit thermal equipment in the process industry. It is the key equipment for balancing the heat energy of the process industry or recovering process waste heat or cooling materials. It is widely used in oil refining, chemical industry, energy, metallurgy, pharmaceutical, food and other industries. In the petrochemical industry, heat exchangers account for 1 / 3 of the total equipment and about 1 / 4 of the equipment investment. Shell-and-tube heat exchangers have the advantages of safety, reliability and durability due to their rotary shell structure, accounting for more than 80% of the total number of heat exchangers in industrial installations. [0003] With the development of science and technology, shell-and-tube heat exchangers are gradually developing to...

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Problems solved by technology

[0005] (1) The influence of cracks on the residual stress of welded joints does not consider the distribution of real residual stress, and most of the residual stress is applied through the preset temperature field, which has a certain deviation from the actual working condition;

[0006] (2) The corrosion sensitivity of heat exchanger materials mainly focuses on the corrosion behavior of the tube and tube sheet base metal, and there is a lack of research on the corrosion sensitivity of different welding areas

[0007] (3) The research on the stress corrosion behavior of the heat exchanger tube head mainly stays on the failure analysis, and there is no relevant report on the influence of crack defects, welding residual stress and microstructure on the stress corrosion sensitivity of the heat exchanger tube head

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