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Electromagnetic Testing - Eddy Curr
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http://igor113.livejournal.com/5121
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Charlie Chong/ Fion Zhang
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同 桌 的 你 Charlie Chong/ Fion
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Fion Zhang at Shanghai 2014/Novembe
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5.0 APPLICATIONS 5.1. Surface testi
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FIG. 5.1. Schematic diagram showing
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Eddy current field extends laterall
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Depth of Penetration & Current Dens
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Please also comment on this illustr
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FIG. 5.2 Directional properties of
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The depth of surface flaws (the dis
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Case Discussion: The corresponding
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5.1.2.2 Types of standard surface t
- Page 29 and 30: (b) Spot probes Spot probes are pro
- Page 31 and 32: FIG. 5.6. A spring loaded probe. Ch
- Page 33 and 34: FIG. 5.5. (a) The core and coil of
- Page 35 and 36: Although it is usually evident by i
- Page 37 and 38: FIG. 5.7. Effects of cores and shie
- Page 39 and 40: 5.1.2.3 Other types of surface prob
- Page 41 and 42: FIG. 5.8. A tangential probe showin
- Page 43 and 44: Compare vertical probe with the FIG
- Page 45 and 46: Discussion Topic- Why in the tangen
- Page 47 and 48: FIG. 5.9. A gap (horseshoe) probe.
- Page 49 and 50: Horseshoe probe - maximum sensitivi
- Page 51 and 52: A gap (horseshoe) probe - Magnetic
- Page 53 and 54: 5.1.3 Testing for surface-breaking
- Page 55 and 56: Eddy Current Testing over painted s
- Page 57 and 58: Testing Frequency: • 200 kHz to 5
- Page 59 and 60: If the fastener is not removed, cra
- Page 61 and 62: Following are some examples of spec
- Page 63 and 64: Threaded Probe Charlie Chong/ Fion
- Page 65 and 66: Eddy Current Testing- Hole fatigue
- Page 67 and 68: Hand operated or manual hole probes
- Page 69 and 70: If motor driven probes are to be us
- Page 71 and 72: FIG. 5.12. Typical rotating hole pr
- Page 73 and 74: Bolt hole probes Charlie Chong/ Fio
- Page 75 and 76: (c) Aircraft wheels: Aircraft wheel
- Page 77 and 78: Aircraft wheels Charlie Chong/ Fion
- Page 79: Automated equipment which will perf
- Page 83 and 84: FIG. 5.3 Charlie Chong/ Fion Zhang
- Page 85 and 86: Although these blocks can be used f
- Page 87 and 88: (f) Scan over the appropriate disco
- Page 89 and 90: 4.1.3.5 Testing in-service welds in
- Page 91 and 92: FIG. 5.14 a. Typical weld testing p
- Page 93 and 94: Since the eddy currents produced at
- Page 95 and 96: For testing, the instrument should
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- Page 101 and 102: Keywords: Typically, the magnetic f
- Page 103 and 104: Multilayer structures - of flaws in
- Page 105 and 106: 5.1.4.2 Probe and frequency selecti
- Page 107 and 108: An acceptable compromise which give
- Page 109 and 110: FIG. 5.15. Eddy current signals fro
- Page 111 and 112: FIG. 5.16. Spot probes testing a la
- Page 113 and 114: ) Sliding probes Sliding probes are
- Page 115 and 116: 5.1.4.4 Reference samples Reference
- Page 117 and 118: 5.1.5 Conductivity testing and mate
- Page 119 and 120: 5.1.5.3 Factors which affect conduc
- Page 121 and 122: (b) Alloying. Dissolving any elemen
- Page 123 and 124: (d) Cold work Plastic deformation o
- Page 125 and 126: (b) Test part thickness The conduct
- Page 127 and 128: (c) Edge effect Probes dedicated to
- Page 129 and 130: 5.1.5.6 Frequency selection The fre
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FIG. 5.19. Impedance diagrams and t
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Charlie Chong/ Fion Zhang
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The Characteristic Parameter (PC) i
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Example: Calculate the optimum freq
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When eddy current conductivity mete
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(d) Perform conductivity measuremen
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5.1.5.9 Heat treatment of aluminium
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5.1.5.10 Sorting materials by magne
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5.1.6 Thickness measurement of non-
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FIG. 5.22. Methods of obtaining sta
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Non-conducting coating thickness me
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A typical operating frequency to me
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5.1.6.4 Measurement procedure (a) C
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(k) (l) Alternatively, if the measu
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5.1.7 Thickness measurement of cond
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5.1.7.2 Probe and frequency selecti
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5.1.7.3 Signals from variations in
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FIG. 5.26. Part of the display show
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5.1.7.5 Measurement procedure (a) C
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(j) (k) Alternatively, if the measu
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5.1.8 Thickness measurement of cond
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FIG. 5.28 shows the impedance curve
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5.2.1.1 Tube testing probes and the
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The coil(s) in bobbin probes produc
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Bobbin probe eddy current the orien
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To obtain adequate sensitivity to f
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As for surface testing, the test se
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5.2.1.2 Selection of test frequency
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The basis for the selection of test
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FIG. 5.32. Impedance diagram showin
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5.2.1.4 Flaw signals from absolute
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At f 90 , all flaw signals appear i
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5.2.1.5 Absolute probe signals from
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Wobble - A-go-go Charlie Chong/ Fio
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Discussion Topic- Discuss on the fo
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(c) Ferromagnetic conditions at the
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A signal from a ferromagnetic condi
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FIG. 5.36 shows the signal from a f
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Tube Sheet: Baffle Plate Charlie Ch
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Tube Sheet: Baffle Plate Charlie Ch
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(e) Non-ferromagnetic support or ba
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This signal will be modified by any
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(f) Ferromagnetic support or baffle
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FIG. 5.37. The signals from a carbo
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FIG. 5.38. Absolute and differentia
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5.2.1.7 Correlating flaw depth and
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FIG. 5.39. Graph showing the correl
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5.2.1.8 Correlating flaw depth and
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5.2.2 Bar and tube testing using en
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Discussion Topic: This means that p
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FIG. 5.41. The eddy current intensi
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5.2.2.2 Selection of frequency For
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Associated with the f/f g concept i
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The optimum operating point depends
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5.2.2.3 Specific test applications
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(c) Flaw detection Surface flaw ind
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5.2.2.4 Testing ferromagnetic bars
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Ferromagnetic material can be teste
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5.3.2 Equipment Most modern eddy cu
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These standards cover such topics a
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The following example is taken from
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The content of written procedures d
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Charlie Chong/ Fion Zhang
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6.5. Records and reports 6.5.1 Test
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6.5.2 Test reports A formal test re
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Records Charlie Chong/ Fion Zhang
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Calibration Standard A test standar
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Coil, probe A small coil or coil as
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Discontinuity Artificial Reference
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Electromagnetic Testing That non de
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IACS σ IACS . International Anneal
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Material, Diamagnetic A material ha
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Parameter A material property or in
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Phase Lag β (beta), radians or deg
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Resistivity ρ (ro), microhm centim
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Signal A change in eddy current ins
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Space Station Charlie Chong/ Fion Z
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Charlie https://www.yumpu.com/en/br
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Good Luck! Charlie Chong/ Fion Zhan