磁记忆检测在小口径钢管中的应用

Application of Magnetic Memory Testing in Small-Diameter Steel Pipes

摘要: 磁记忆检测是一种新兴的管道检测技术，在内部压力作用下，管道缺陷处会产生应力集中，使得管道自漏磁场发生改变。本文以含气孔缺陷的管道为研究对象，利用COMSOL Multiphysics软件分析缺陷对管道自漏磁场的影响。研究表明：缺陷会使缺陷部位前的法向磁场分量Hy和轴向磁场分量Hz产生一次突变，且会增大管道的Hy和Hz数值；在研究的范围内，气孔尺寸、在焊缝中的位置对自漏磁场影响较大，管道压力的影响很小。研究成果为磁记忆检测用于管道焊缝缺陷检测提供了依据。

Abstract: Magnetic memory testing is an emerging pipeline inspection technology. Under internal pressure, stress concentration occurs at pipeline defects, leading to changes in the pipeline’s self-magnetic leakage field. This paper studies pipelines with porosity defects, using COMSOL Multiphysics software to analyze the impact of defects on the pipeline’s self-magnetic leakage field. The study shows that defects cause a sudden change in the normal magnetic field component Hy and axial magnetic field component Hz ahead of the defect, and increase the values of Hy and Hz in the pipeline. Within the scope of the study, the size and location of the porosity in the weld have a significant impact on the self-magnetic leakage field, while the influence of pipeline pressure is minimal. The research results provide a basis for the application of magnetic memory testing in detecting weld defects in pipelines.