Magnetizing Method for High Precision MFL Inspection of Longitudinal Defects of Thick Wall Steel Pipe

Bo Feng; Jian Bo Wu; Yun Yang; Yi Hua Kang

doi:10.4028/www.scientific.net/AMR.718-720.898

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 718-720Magnetizing Method for High Precision MFL...

Magnetizing Method for High Precision MFL Inspection of Longitudinal Defects of Thick Wall Steel Pipe

Abstract:

Circumferential magnetization of the thick wall steel pipe is carried out for the inspection of longitudinal defects in magnetic flux leakage testing. For high precision magnetic flux leakage testing, magnetic field distribution along the axial direction must be uniform, thus a new type of pole shoe structure is proposed in this paper to enlarge the uniformly magnetized area. Thick wall steel pipes are hard to be magnetized to near saturation, especially when the new pole shoe is used, which makes difficult for the magnetic sensors to pick up the magnetic leakage field. Therefore, the relationship between the magnetic flux density of the detection zone and the dimensions of the magnetizer has been studied by finite element simulation. These results are helpful in the design of circumferential magnetizer.

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Periodical:

Advanced Materials Research (Volumes 718-720)

Pages:

898-902

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.718-720.898

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Online since:

July 2013

Authors:

Bo Feng, Jian Bo Wu, Yun Yang, Yi Hua Kang

Keywords:

Circumferential Magnetization, Finite Element Method (FEM), Magnetic Flux Leakage Testing (MFL), Nondestructive Testing (NDT), Thick Wall Steel Pipes

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