A Study of the Quantitative Nondestructive Evaluation Using the Cross Type Magnetic Source and the Magnetic Camera

Abstract:

The magnetic camera using magnetic lens is proposed to satisfy the demands such as obtaining the distribution of the magnetic flux leakage (DMFL) on the high lift-off, and improving sensitivity. However, DMFL is strongly affected by the magnetization direction. Therefore, the DMFL has low intensity when the crack is not perpendicular to the magnetizing direction. Also, quantitative nondestructive evaluation would be difficult. This paper proposes an improved magnetization method to evaluate a crack quantitatively, regardless of the crack direction. The secondary magnetic source, which is perpendicular to the primary magnetic source, is introduced in the scan type magnetic camera. The intensity of two values of ∂B/∂x (1st differential to the magnetization direction) of the DMFL can be used to evaluate the crack volume. The experimental and the numerical analysis results are considered to verify this phenomenon.

• Periodical: Key Engineering Materials (Volumes 321-323)
• Pages: 1447-1450
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.321-323.1447
• Online since: October 2006
• Authors: Jin Yi Lee, Ji Seong Hwang
• Keywords: Cross Type Magnetic Source, Dipole Model, Magnetic Camera, Magnetic Flux Leakage (MFL)

References

[1] J. Lee, W. Choe, M. Kim, D. Kim and M. Kang: US patents 6, 683, 452 B2 (2004).

[2] J. Lee, J. Hwang, K. Lee and S. Choi: Key Engineering Materials Vol. 306a308 (2006), p.235.

[3] J. Lee, J. Hwang, S. Choi and J. Lim: Key Engineering Materials Vol. 241a246 (2006), p.231.

[4] J. Lee, J. Hwang, T. Shji and J. Lim: Key Engineering Materials Vol. 297~300 (2005), p. (2022).

[5] J. Hwang and J. Lee: Proc. ICCAS2005, (2005), p.1830 Fig. 6 The relationship between the crack volume and the DSVcross.