ACFM Nondestructive testing

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Actual Fatigue cracks - Figure 17: A higher magnification photomicrograph unetched view of the indicated boxed area in Figure 16. High temperature oxides line the separation indicating a lack of fusion at this location. (Photo C8175, Mag: 100X, unetched) Charlie Chong/ Fion Zhang http://met-tech.com/crane-weldment-failure.html
Actual Fatigue cracks - Figure 18: A higher magnification photomicrograph of the indicated boxed area in Figure 16. The fatigue crack (arrow) has propagated from the non-fused weld/pipe interface, into the reinforcing fillet weld. The boxed area is further magnified in Figure 19. (Photo C8183, Mag: 50X) Charlie Chong/ Fion Zhang http://met-tech.com/crane-weldment-failure.html
Page 1 and 2: Electromagnetic Testing MFLT/ ECT/
Page 3 and 4: Charlie Chong/ Fion Zhang
Page 21 and 22: 苏州太湖 2014 Fion Zhang at
Page 23 and 24: Alternating Current Field Measureme
Page 25 and 26: The simplification in mathematical
Page 27 and 28: The uniform alternating current in
Page 29 and 30: Mathematical model display of Bx &
Page 31 and 32: Keywords: ■ By using mathematical
Page 33 and 34: 10.0.3 Prime Advantages: Non Contac
Page 35 and 36: 10.0.4 Limitation Simple Semi Ellip
Page 37 and 38: The B x & B z Display Charlie Chong
Page 39 and 40: FIGURE 16. Probability of detection
Page 41 and 42: Actual Fatigue cracks Charlie Chong
Page 43: Actual Fatigue cracks - Figure 16:
Page 47 and 48: Actual Fatigue cracks - Figure 20:
Page 49 and 50: Actual Fatigue cracks Charlie Chong
Page 51 and 52: Actual Fatigue cracks- Fractographi
Page 53 and 54: Actual Fatigue cracks- Micrographs
Page 55 and 56: Actual Fatigue cracks- Micrographs
Page 57 and 58: Stress Corrosion Cracking Charlie C
Page 59 and 60: Stress Corrosion Cracking Charlie C
Page 61 and 62: In the 1980s, there were moves to d
Page 63 and 64: 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
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FIGURE 2. Coordinates conventionall
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B x will have a constant positive v
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Figure 3 shows the effect of a surf
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Keywords: • Counter clockwise cur
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FIGURE 4. Data from longitudinal di
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Software algorithms The actual para
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0 A measurement unit is needed to q
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Charlie Chong/ Fion Zhang In ACFM:
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10.2.3 Uniform Field The alternatin
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10.2.3.1 Advantages (I) Testing thr
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Keywords: The Current Field • Ind
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10.2.3.2 Disadvantages (I) Reduced
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Geometry Changes. Charlie Chong/ Fi
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Geometry Changes - Simple leg weldm
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The uniform field theoretical model
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Crack Charlie Chong/ Fion Zhang htt
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ACFM currents flowing around a defe
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The maximum coating thickness throu
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FIGURE 6. Effect of coating thickne
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Effect of coating thickness on Bx f
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Discussion Subject: “FIGURE 7. Co
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Keywords: The points at which the c
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The Eddy Current Standard Depth & P
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Discussion: when the coil is larger
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FIGURE 9. Comparison of 5 kHz and 5
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Discussion: Compare Figure 9 & Figu
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In this way, the changing signal fr
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FIGURE 12. Estimation of background
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This combination results in an upwa
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For discontinuities within about 30
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FIGURE 13. Magnetic flux density si
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FIGURE 14. Magnetic flux density fr
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More Reading on: Data Display The p
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10.2.9 Restrictions in Theoretical
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Practical alternating current field
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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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Charlie Chong/ Fion Zhang
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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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