Electromagnetic Testing - Eddy Current Testing Applications Chapter 5 & 6

More documents

Recommendations

Info

Discussion Topic- Magnetic indications can be distinguished from discontinuities by retesting at a reduced test frequency. Tip: Lenz’s law on the direction of flow of current. Charlie Chong/ Fion Zhang
5.1.6 Thickness measurement of non-conductive coatings 5.1.6.1 Introduction The thickness of non-conducting coatings on conductors is measured by measuring the amount of lift-off the coatings produce. The technique can be applied equally to ferromagnetic or non-ferromagnetic materials, and can also be used to measure the thickness of nonconductors like plastic sheet, by laying them on top of a flat conductor. Most modern digital eddy current instruments when used in conductivity mode, provide a digital readout of both conductivity and lift off (non-conductive coating thickness). Comparative measurements can also be made using the impedance plane and are summarised as follows. Charlie Chong/ Fion Zhang
Page 1 and 2:
Electromagnetic Testing - Eddy Curr
Page 3 and 4:
http://igor113.livejournal.com/5121
Page 5 and 6:
Charlie Chong/ Fion Zhang
Page 7 and 8:
同桌的你 Charlie Chong/ Fion
Page 9 and 10:
Fion Zhang at Shanghai 2014/Novembe
Page 11 and 12:
5.0 APPLICATIONS 5.1. Surface testi
Page 13 and 14:
FIG. 5.1. Schematic diagram showing
Page 15 and 16:
Eddy current field extends laterall
Page 17 and 18:
Depth of Penetration & Current Dens
Page 19 and 20:
Please also comment on this illustr
Page 21 and 22:
FIG. 5.2 Directional properties of
Page 23 and 24:
The depth of surface flaws (the dis
Page 25 and 26:
Case Discussion: The corresponding
Page 27 and 28:
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 and 80:
Automated equipment which will perf
Page 81 and 82:
Tangential probe - used in electron
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
Page 97 and 98: Charlie Chong/ Fion Zhang
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
Page 131 and 132: FIG. 5.19. Impedance diagrams and t
Page 135 and 136: The Characteristic Parameter (PC) i
Page 137 and 138: Example: Calculate the optimum freq
Page 139 and 140: When eddy current conductivity mete
Page 141 and 142: (d) Perform conductivity measuremen
Page 143 and 144: 5.1.5.9 Heat treatment of aluminium
Page 145: 5.1.5.10 Sorting materials by magne
Page 149 and 150: FIG. 5.22. Methods of obtaining sta
Page 151 and 152: Non-conducting coating thickness me
Page 153 and 154: A typical operating frequency to me
Page 155 and 156: 5.1.6.4 Measurement procedure (a) C
Page 157 and 158: (k) (l) Alternatively, if the measu
Page 159 and 160: 5.1.7 Thickness measurement of cond
Page 161 and 162: 5.1.7.2 Probe and frequency selecti
Page 163 and 164: 5.1.7.3 Signals from variations in
Page 165 and 166: FIG. 5.26. Part of the display show
Page 167 and 168: 5.1.7.5 Measurement procedure (a) C
Page 169 and 170: (j) (k) Alternatively, if the measu
Page 171 and 172: 5.1.8 Thickness measurement of cond
Page 173 and 174: FIG. 5.28 shows the impedance curve
Page 175 and 176: 5.2.1.1 Tube testing probes and the
Page 177 and 178: The coil(s) in bobbin probes produc
Page 179 and 180: Bobbin probe eddy current the orien
Page 181 and 182: To obtain adequate sensitivity to f
Page 183 and 184: As for surface testing, the test se
Page 185 and 186: 5.2.1.2 Selection of test frequency
Page 187 and 188: The basis for the selection of test
Page 189 and 190: FIG. 5.32. Impedance diagram showin
Page 191 and 192: 5.2.1.4 Flaw signals from absolute
Page 193 and 194: At f 90 , all flaw signals appear i
Page 195 and 196: 5.2.1.5 Absolute probe signals from
Page 197 and 198:
Wobble - A-go-go Charlie Chong/ Fio
Page 199 and 200:
Discussion Topic- Discuss on the fo
Page 201 and 202:
(c) Ferromagnetic conditions at the
Page 203 and 204:
A signal from a ferromagnetic condi
Page 205 and 206:
FIG. 5.36 shows the signal from a f
Page 207 and 208:
Tube Sheet: Baffle Plate Charlie Ch
Page 209 and 210:
Tube Sheet: Baffle Plate Charlie Ch
Page 211 and 212:
(e) Non-ferromagnetic support or ba
Page 213 and 214:
This signal will be modified by any
Page 215 and 216:
(f) Ferromagnetic support or baffle
Page 217 and 218:
FIG. 5.37. The signals from a carbo
Page 219 and 220:
FIG. 5.38. Absolute and differentia
Page 221 and 222:
5.2.1.7 Correlating flaw depth and
Page 223 and 224:
FIG. 5.39. Graph showing the correl
Page 225 and 226:
5.2.1.8 Correlating flaw depth and
Page 227 and 228:
5.2.2 Bar and tube testing using en
Page 229 and 230:
Discussion Topic: This means that p
Page 231 and 232:
FIG. 5.41. The eddy current intensi
Page 233 and 234:
5.2.2.2 Selection of frequency For
Page 235 and 236:
Associated with the f/f g concept i
Page 237 and 238:
The optimum operating point depends
Page 239 and 240:
5.2.2.3 Specific test applications
Page 241 and 242:
(c) Flaw detection Surface flaw ind
Page 243 and 244:
5.2.2.4 Testing ferromagnetic bars
Page 245 and 246:
Ferromagnetic material can be teste
Page 247 and 248:
5.3.2 Equipment Most modern eddy cu
Page 249 and 250:
These standards cover such topics a
Page 251 and 252:
The following example is taken from
Page 253 and 254:
The content of written procedures d
Page 255 and 256:
Charlie Chong/ Fion Zhang
Page 257 and 258:
6.5. Records and reports 6.5.1 Test
Page 259 and 260:
6.5.2 Test reports A formal test re
Page 261 and 262:
Records Charlie Chong/ Fion Zhang
Page 263 and 264:
Calibration Standard A test standar
Page 265 and 266:
Coil, probe A small coil or coil as
Page 267 and 268:
Discontinuity Artificial Reference
Page 269 and 270:
Electromagnetic Testing That non de
Page 271 and 272:
IACS σ IACS . International Anneal
Page 273 and 274:
Material, Diamagnetic A material ha
Page 275 and 276:
Parameter A material property or in
Page 277 and 278:
Phase Lag β (beta), radians or deg
Page 279 and 280:
Resistivity ρ (ro), microhm centim
Page 281 and 282:
Signal A change in eddy current ins
Page 283 and 284:
Space Station Charlie Chong/ Fion Z
Page 285 and 286:
Charlie https://www.yumpu.com/en/br
Page 287:
Good Luck! Charlie Chong/ Fion Zhan
show all

Electromagnetic Testing - Eddy Current Testing Applications Chapter 5 & 6

Create successful ePaper yourself

Delete template?

Save as template?