Detectability of an artificial slot, placed at the bottom of a steel plate was investigated by the method of Magnetic adaptive testing (MAT), when the measurement was performed through another steel plate. Influence of an air gap (or of a nonmagnetic spacer) located either between the magnetizing yoke and the top plate surface or between the two plates was explored. It was found that if the thickness of the nonmagnetic spacer was not larger than 0.15 mm, it had no influence on the detectability of the slot in the given geometry. This result shows an excellent applicability of MAT, and it is encouraging for possible future practical applications. The empirical data were compared with results of an electromagnetic simulation, and the outcome was interpreted and explained.
CrockettH.M. and HorowitzJ.S., Erosion in nuclear piping systems, J. Pressure Vessel Technology132 (2010), 024501-1.
2.
NishiguchiI.InadaF.TakahashiM.OgawaB.InagakiT.OhiraT.IwaharaK. and YamakamiK., A Review: Japanese Pipe wall thinning management based on JSME rules recent R&D studies performed to enhance the rules, E-Journal of Advanced Maintenance2 (2010/2011), 14–24.
3.
KajiwaraG., Improvement to X-ray piping diagnostic system through simulation, J of Testing and Evaluation33 (2005), 574–583.
4.
JuY., Remote measurement of pipe wall thinning by microwaves, Advanced Nondestructive Evaluation II2 (2007), 1128–1133.
5.
LeonardK.R. and HindersM.K., Lamb wave tomography of pipe-like structures, Ultrasonic43 (2005), 574–583.
6.
ChoZ.OhW.D. and LeeJ.H., A wall thinning detection and quantification based on guided wave mode conversion features, Key Engineering Materials321–323 (2006), 795–798.
7.
LeeD.H.LeeS.J.LeeJ.H. and LeeS.H., Analysis of round robin test for ultrasonic thickness measurement of wall thinned pipe in nuclear power plant, AIP Conf Proc975 (2008), 1732–1738.
8.
NamK.W. and AhnS.H., Fracture behaviors and acoustic emission characteristics of pipes with local wall thinning, Key Engineering Materials270–273 (2004), 461–465.
9.
MitaniK.MochizukiM. and ToyodaM., Investigation of Wall Thinning Measurement in Steel Plates by Electromagnetic Acoustic Resonance, Materials Science Forum580–582 (2008), 113–116.
10.
KosakaD.KojimaF. and YamaguchiH., Quantitative evaluation of wall thinning in pipe wall using electromagnetic acoustic transducer, International Journal of Applied Electromagnetics and Mechanics33 (2010), 1195–1200.
11.
SchmidtT.R.,The remote field eddy current inspection technique,Materials Evaluation,42(1984),225–230.
12.
LinkousA.I.N. and McKnightB., Using thermography to detect and measure wall thinning, in: Proc. SPIE, Thermosense XV: An International Conference on Thermal Sensing and Imaging Diagnostic ApplicationsAllenL.R. ed, Vol. 933, Orlando 1993, pp. 26–30.
13.
ZuoyingH.PeiwenQ. and LiangC., 3D FEM analysis in magnetic flux leakage method, NDT & E International39 (2006), 61–66.
14.
JoshiA.UdpaL.UdpaS. and TamburrinoA., Adaptive Wavelets for Characterizing Magnetic Flux Leakage Signals From Pipeline Inspection, IEEE Transactions on Magnetics42 (2006), 3168–3170.
15.
LiX.LiX.ChenL.QinG.FengP. and HuangZ., Steel pipeline testing using magnetic flux leakage method, in: IEEE International Conference on Industrial Technology, 2008, pp. 1–4.
16.
KikuchiH.KurisawaY. and AraK., Feasibility study of magnetic flux leakage method for condition monitoring of wall thinning on tube, Int J Appl Electromagnetics and Mechanics33 (2010), 1087–1094.
17.
SinghW.S. et al., Detection of Localized damage in water wall tubes of thermal power plants using GMR sensor array based magnetic flux leakage technique, Journal of Nondestructive Evaluation34 (2015), Article Number: 19.
18.
ChengW., Nondestructive Testing of Back-Side Local Wall-Thinning by Means of Low Strength Magnetization and Highly Sensitive Magneto-Impedance Sensors, IEEE Sensors Journal16 (2016), 5548–5556.
19.
AnganiC.S.ParkD.G.KimG.D.KimC.G. and CheongY.M., Differential pulsed eddy current sensor for the detection of wall thinning in an insulated stainless steel pipe, Journal of Applied Physics107 (2010), 09E720-3.
20.
KimJ.YangG.UdpaL. and UdpaS., Classification of pulsed eddy current GMR data on aircraft structures, NDT E International43 (2010), 141–144.
21.
XieS.YamamotoT.TakagiT. and UchimotoT., Pulsed ECT method for evaluation of pipe wall-thinning of nuclear power plants using magnetic sensors, in: Proc. of ENDE 2010 Conference, 13–16 June 2010, Szczecin, Poland, pp. 7–8.
22.
KikuchiH.SatoK.ShimizuI. and KamadaY., Feasibility Study of Application of MFL to Monitoring of Wall Thinning Under Reinforcing Plates in Nuclear Power Plants, IEEE Trans Magn47 (2010), 3963–3966.
23.
KikuchiH.ShimuzuI.AraK.KamadaY. and KobayashiS., Applicability of magnetic flux leakage method for wall thinning monitoring in nuclear power plants, in: Electromagnetic Nondestructive Evaluation (XIV)ChadyT. et al. IOS Press, 2011, pp. 275–281.
24.
VértesyG.TomášI.UchimotoT. and TakagiT., Nondestructive investigation of wall thinning in layered ferromagnetic material by magnetic adaptive testing, NDT&E International47 (2012), 51–55.
25.
VértesyG.TomášI.UchimotoT. and TakagiT., Nondestructive investigation of wall thinning in doubled layer tube by Magnetic Adaptive Testing, E-Journal of Advanced Maintenance4(2) (2012), 96–104.
26.
TomášI.KadlecováJ. and VértesyG., Measurement of flat samples with rough surfaces by Magnetic Adaptive Testing, IEEE Trans Magn48 (2012), 1441–1444.
27.
VértesyG.BálintB.BinglerA.GyimóthyS.BiliczS. and PávóJ., Simulation of magnetic flux distribution for the measurement of the local thinning of ferromagnetic plates, International Journal of Applied Electromagnetics and Mechanics55 (2017), 597–612.
28.
TomášI. and VértesyG., Magnetic Adaptive Testing, in: Nondestructive TestingOmarM. ed., InTech-d.o.o. – Open Access publisher: www.intechopen.com (ISBN 979-953-307-487-9).
