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System and method for preparing longitudinal submerged arc welding (LSAW)

A technology of longitudinal submerged arc welding and welded pipes, which is applied in the system field of preparing longitudinal submerged arc welded pipes, can solve the problems of unstable yield strength and tensile properties, achieve the effect of reducing the fluctuation range and improving the qualified rate

Active Publication Date: 2015-05-06
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a system and method for preparing longitudinal submerged arc welded pipes, which solves the technical problem that the high-strength longitudinal submerged arc welded pipes often have unstable yield strength to tensile properties in the prior art

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  • System and method for preparing longitudinal submerged arc welding (LSAW)

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Embodiment Construction

[0019] A system for preparing longitudinal submerged arc welded pipes provided by an embodiment of the present invention includes a diameter expansion rate relationship module, a function judgment module, and a plate width adjustment module;

[0020] The diameter expansion rate relationship module, according to the yield strength of the steel plate, the yield strength of the welded pipe and the diameter expansion rate of the welded pipe, establishes the functional relationship between the diameter expansion rate and the yield strength;

[0021] The function judgment module is used to compare the yield strength of the steel plate with the set steel plate yield strength threshold, compare the welded pipe yield strength with the set welded pipe yield strength threshold, and obtain the steel plate yield strength comparison result and the welded pipe yield strength comparison result respectively;

[0022] The plate width adjustment module adjusts the plate width of the welded pipe a...

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Abstract

The invention discloses a system and a method for preparing longitudinal submerged arc welding (LSAW), and belongs to the technology field of petroleum and natural gas pipe. The system comprises an expending-ratio relation module, which establishes a function relation between the expending-ratio and the yield strength according to the yield strength of steel board, the yield strength of welding pipe, and the expending-ratio of welding pipe; a function judge module, which is used for comparing the yield strength of steel board to the given yield strength threshold of steel board, comparing the yield strength of welding pipe to the given yield strength threshold of welding pipe, and obtaining the comparative result of yield strength of steel board and comparative result of yield strength of welding pipe; and a board width adjusting module, which adjusts expending-ratio through adjusting the board width of welding pipe according to the comparative result of yield strength of steel board, comparative result of yield strength of welding pipe, and the function relation. The system and the method for preparing longitudinal submerged arc welding (LSAW) realize accurate control of stretch performance of steel pipe, raise the qualified rate, and reduce the fluctuating range.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas pipelines, in particular to a system and method for preparing straight seam submerged arc welded pipes. Background technique [0002] The construction of oil and gas pipelines requires a large number of high-performance steel pipes. At present, a large number of steel pipes used in high-pressure, large-diameter, and large-transport oil and gas pipelines use X80 grade submerged arc welding (SAWL) pipes. Tensile performance is the most basic and important performance of pressure-bearing steel pipes. During the production process of X80 longitudinal submerged arc welded pipes, the tensile performance index yield-to-strength ratio is often unqualified (required to be less than or equal to 0.93), resulting in scrapped steel pipes. Even if it does not exceed the standard but deviates from the upper limit, it is not good for the safe operation of the pipeline. In addition, analyzing the qual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/08
Inventor 李为卫刘亚旭贾君君杨扬徐婷马小芳屈忆欣
Owner BC P INC CHINA NAT PETROLEUM CORP
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