ACFM Nondestructive testing

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(III) Material Boundaries. A third advantage of a uniform field arises when <strong>testing</strong> at a weld or other boundary between two metals of different permeability or conductivity. In this case, if the probe is scanning for discontinuities parallel to the boundary, no probe motion is required across the boundary and no signals are caused by the change in material property. Also, the currents are flowing perpendicularly across the boundary, so the effect of this material change is reduced even when scanning up to it. the currents are flowing perpendicularly across the boundary Charlie Chong/ Fion Zhang
10.2.3.2 Disadvantages (I) Reduced Sensitivity. The main disadvantage of using a uniform field is that sensitivity is reduced. This reduction is of little consequence on welded or rough surfaces, where sensitivity would be reduced anyway. On smooth, clean surfaces, however, alternating current field measurement is less sensitive to short or shallow discontinuities than conventional eddy current techniques. The smallest detectable discontinuity on a good surface with alternating current field measurement is around 2 mm (0.08 in.) long or 0.25 mm (0.01 in.) deep. Keywords: The smallest detectable discontinuity on a good surface with alternating current field measurement is around 2 mm(0.08 in.) long or 0.25 mm (0.01 in.) deep. Charlie Chong/ Fion Zhang
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Electromagnetic Testing MFLT/ ECT/
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Charlie Chong/ Fion Zhang
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苏州太湖 2014 Fion Zhang at
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Alternating Current Field Measureme
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The simplification in mathematical
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The uniform alternating current in
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Mathematical model display of Bx &
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Keywords: ■ By using mathematical
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10.0.3 Prime Advantages: Non Contac
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10.0.4 Limitation Simple Semi Ellip
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The B x & B z Display Charlie Chong
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FIGURE 16. Probability of detection
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Actual Fatigue cracks Charlie Chong
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Actual Fatigue cracks - Figure 16:
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Actual Fatigue cracks Charlie Chong
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Actual Fatigue cracks- Fractographi
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Actual Fatigue cracks- Micrographs
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Actual Fatigue cracks- Micrographs
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Stress Corrosion Cracking Charlie C
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Stress Corrosion Cracking Charlie C
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In the 1980s, there were moves to d
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10.1.2 Alternating Current Potentia
Page 65 and 66: An induced field can be achieved ei
Page 67 and 68: 10.1.3 Magnetic Field Measurement W
Page 69 and 70: Keywords: ■ Alternating current f
Page 71 and 72: ACFM Charlie Chong/ Fion Zhang http
Page 73 and 74: ACFM Charlie Chong/ Fion Zhang http
Page 75 and 76: Encoded Probe (XYZ) Charlie Chong/
Page 77 and 78: Array Probe with multi-sensors Char
Page 79 and 80: Probe Arrays give the opportunity f
Page 81 and 82: Probes with different geometries Ch
Page 83 and 84: Probes with different geometries Ch
Page 85 and 86: Ovality Probe Charlie Chong/ Fion Z
Page 87 and 88: This feature of alternating current
Page 89 and 90: Crack- Fatigue Charlie Chong/ Fion
Page 91 and 92: The sizing tables have been produce
Page 93 and 94: FIGURE 1. Uniform magnetic field ge
Page 95 and 96: FIGURE 2. Coordinates conventionall
Page 97 and 98: B x will have a constant positive v
Page 99 and 100: Figure 3 shows the effect of a surf
Page 101 and 102: Keywords: • Counter clockwise cur
Page 103 and 104: FIGURE 4. Data from longitudinal di
Page 105 and 106: Software algorithms The actual para
Page 107 and 108: 0 A measurement unit is needed to q
Page 109 and 110: Charlie Chong/ Fion Zhang In ACFM:
Page 111 and 112: 10.2.3 Uniform Field The alternatin
Page 113 and 114: 10.2.3.1 Advantages (I) Testing thr
Page 115: Keywords: The Current Field • Ind
Page 119 and 120: Geometry Changes. Charlie Chong/ Fi
Page 121 and 122: Geometry Changes - Simple leg weldm
Page 123 and 124: The uniform field theoretical model
Page 125 and 126: Crack Charlie Chong/ Fion Zhang htt
Page 127 and 128: ACFM currents flowing around a defe
Page 129 and 130: The maximum coating thickness throu
Page 131 and 132: FIGURE 6. Effect of coating thickne
Page 133 and 134: Effect of coating thickness on Bx f
Page 135 and 136: Discussion Subject: “FIGURE 7. Co
Page 137 and 138: Keywords: The points at which the c
Page 139 and 140: The Eddy Current Standard Depth & P
Page 141 and 142: Discussion: when the coil is larger
Page 143 and 144: FIGURE 9. Comparison of 5 kHz and 5
Page 145 and 146: Discussion: Compare Figure 9 & Figu
Page 147 and 148: In this way, the changing signal fr
Page 149 and 150: FIGURE 12. Estimation of background
Page 151 and 152: This combination results in an upwa
Page 153 and 154: For discontinuities within about 30
Page 155 and 156: FIGURE 13. Magnetic flux density si
Page 157 and 158: FIGURE 14. Magnetic flux density fr
Page 159 and 160: More Reading on: Data Display The p
Page 161 and 162: 10.2.9 Restrictions in Theoretical
Page 163 and 164: Practical alternating current field
Page 165 and 166: Keywords: • Calibrated once, at t
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The restriction to semielliptical c
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Liftoff The signal intensity reduce
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FIGURE 15. Amplitude of magnetic fl
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Trials with alternating current fie
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FIGURE 16. Probability of detection
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Another independent evaluation of t
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Remotely operated vehicle. ROV Char
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Remotely operated vehicle. ROV Char
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Further tests were carried out blin
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FIGURE 17. Experimental probability
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10.3.2 Influences on Sizing Accurac
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Crack Inclination Charlie Chong/ Fi
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10.3.2.2 Morphology On the other ha
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Rail Track Charlie Chong/ Fion Zhan
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10.3.2.4 Geometry Effects Geometric
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10.3.3 Sensor Coverage and Lateral
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FIGURE 18. Lateral displacement at
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Figure 19 shows the experimental ef
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FIGURE 19. Decrease in predicted de
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FIGURE 13. Magnetic flux density si
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10.4 PART 4. Alternating Current Fi
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Fatigue Crack Charlie Chong/ Fion Z
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10.4.1.2 Stress Corrosion Cracking
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Sulfide stress concentration cracks
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10.4.2 Corrosion Pitting The unidir
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ACFM systems have been used for a r
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Figure: Array Probe Display Charlie
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Figure: ACFM Underwater Application
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10.5.2.2 Application of the ACFM in
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Figure: Above Ground Storage Tank C
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Figure: Above Ground Storage Tank f
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Why ACFM Leakage due to cracking at
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Figure: Encoder array probe used to
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Figure: High speed inspection of wa
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Figure: Compliant array probe inspe
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Figure: Compliant array probe inspe
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ACFM Inspection Result- Tank#1 On o
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Figure: Defective region Charlie Ch
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Figure: Localised corrosion under w
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Conclusions The ability to inspect
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Other sample result display Charlie
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Figure 1: An actual ACFM screen cap
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Subsea Structures Charlie Chong/ Fi
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Offshore lift Charlie Chong/ Fion Z
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Expert at Works Charlie Chong/ Fion
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2015- 学习总是开心事 C
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2015- 学习总是开心事 C
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上海老照片 Charlie Chong/
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Shanghai 南浦大桥 -4 2015-
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ACFM Nondestructive testing

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