Pipeline steel welding parameter determining method and welding method
A welding parameter and determination method technology, applied in the pipeline steel welding parameter determination method and welding field, can solve the problems such as the decrease of base metal toughness, achieve the effect of simplifying welding operation steps, ensuring accuracy and improving welding work efficiency
Pending Publication Date: 2021-11-02
TIANJIN UNIV
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[0003] Welding is the most commonly used connection method in the process of pipeline laying and maintenance, which has the advantages of low cost and high efficiency, but the heat input caused by welding makes the toughness of the weld area significantly lower than that of the base metal
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[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0047] More and more crude oils have high sulfur content, represented by hydrogen sulfide. When wet hydrogen sulfide coexists with acidic medium, hydrogen-induced cracking (HIC) will occur, that is, in the absence of external force, due to the The existence causes crack initiation and propagation. During the actual service process, the pipeline is affected by external factors such as wave and current impact and crustal changes, and there will be stress. Under ...
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The invention discloses a pipeline steel welding parameter determining method and a welding method. The pipeline steel welding parameter determining method comprises the following steps: enabling a to-be-welded sample to be subjected to a welding thermal simulation experiment; processing the sample subjected to thermal simulation into a hydrogen embrittlement sample by a hydrogen embrittlement method, and calculating hydrogen embrittlement sensitivity parameters; processing the sample subjected to thermal simulation into a CTOD sample through a CTOD experiment method, and calculating fracture toughness parameters; performing a slow tensile experiment on the sample subjected to thermal simulation to obtain a slow tensile sample, and calculating corrosion cracking sensitivity parameters; analyzing and determining a target cooling time period by combining the hydrogen embrittlement sensitivity parameters, the fracture toughness parameters and the corrosion cracking sensitivity parameters; determining a relation between the target cooling time period and welding heat input according to a three-dimensional heat transfer formula, and calculating the welding heat input; calculating welding parameters according to the relation between the welding heat input and the welding parameters. Under the action of prestrain, synergistic improvement of sulfur-induced stress corrosion cracking resistance and fracture toughness of a coarse grain area of a welding heat affected zone of the pipeline steel under the condition of large deformation is achieved.
Description
technical field [0001] The invention relates to the field of welding technology, in particular to a method for determining welding parameters of pipeline steel and a welding method. Background technique [0002] At present, my country's oil reserves are low, and the degree of dependence on foreign countries has increased year by year, which has become a difficult problem restricting economic development. To solve the problem of oil supply, it is necessary to increase the development of domestic oil and gas resources. Oceanic areas have high resource reserves, and compared with terrestrial resources, they have not been fully developed, so their exploration is of great significance and value, especially in the deep sea. Pipeline transportation is the most economical, effective and safe transportation method in the process of oil and gas transportation. How to improve the service life of pipeline steel, reduce mining costs and pipeline failure risks is the most urgent problem t...
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IPC IPC(8): B23K9/00B23K9/095G01N33/207G01N3/08B23K101/10
CPCB23K9/00B23K9/095G01N33/207G01N3/08G01N2203/0017G01N2203/0067G01N2203/024G01N2203/0298B23K2101/10
Inventor 韩永典费继缘徐连勇赵雷郝康达荆洪阳
Owner TIANJIN UNIV