Quality control method for longitudinal strength of steel pipe based on pipe girth weld strength matching

Abstract

The invention discloses a steel pipe longitudinal strength quality control method based on pipeline girth weld strength matching. The process includes determining the strength level of the steel pipe, collecting actual weld metal strength data of equal-strength welding consumables, calculating the normal distribution mean value of the weld metal strength and Standard deviation, calculation of the minimum strength of weld metal, determination of the mean value of the longitudinal strength of the steel pipe, determination of the minimum longitudinal strength of the steel pipe, calculation of the standard deviation of the normal distribution of the longitudinal strength of the steel pipe, calculation of the maximum longitudinal strength of the steel pipe, determination of the control range of the longitudinal strength of the steel pipe, formulation and revision Steel plate technical conditions and quality control scheme. With this method, the longitudinal strength of the steel pipe can be controlled from the source, so as to ensure that the strength of the pipe girth weld is matched to the same strength, avoiding the ring caused by the selection of the welding process and welding materials by the minimum tensile strength of the steel pipe circumferential direction stipulated in the standard. The actual strength of the weld is lower than the longitudinal strength of the steel pipe, thereby greatly reducing the occurrence of pipe girth weld fracture accidents and ensuring the safe operation of the pipeline.

Description

technical field [0001] The invention belongs to the technical field of pipeline girth weld welding and steel pipe manufacturing, and relates to a steel pipe longitudinal strength quality control method based on pipeline girth weld strength matching. Background technique [0002] As the demand for energy continues to increase, large-scale construction of oil and gas transmission pipelines has begun worldwide. However, long-distance oil and gas pipelines often pass through complex regions such as deserts, plains, waters, mountains, and densely populated cities and towns. Their safe and reliable operation is of great significance to society and the natural environment, and once they fail, they will lead to catastrophic accidents. Statistics show that most of the failure accidents of long-distance pipelines at home and abroad are caused by the fracture of the girth weld, and the strength matching of the girth weld plays a vital role in the failure of the pipeline fracture. [0...

AI Technical Summary

Problems solved by technology

Moreover, the pipeline design in most countries still adopts more stress design, and the design documents and manufacturing standards or technical conditions only stipulate the circumferential strength of the steel pipe, and there is no specific control requirement for the longitudinal strength of the steel pipe, nor is it based on the pipe girth weld Strength matching requirements to control the longitudinal strength method of steel pipes

If the circumferential strength of the steel pipe body is still specified in the standard to select the welding material and process, the problem of strength matching of the girth weld joint will not be solved at all, and it is very likely to cause the failure of the girth weld of the pipeline, resulting in catastrophic accidents

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