Electromagnetic Testing Chapter 3- Electromagnetic Testing

More documents

Recommendations

Info

Figure 3.31 ETC-2000 configured with large interface module, manual positioning, and scanning a jet engine part. Courtesy of UniWest. Charlie Chong/ Fion Zhang
ETC-2000 scanner features include: • Continuous circumferential rotation • Radial indexing for webs • Coordinated motion for slots • Axial indexing for bores • Manual probe positioning Field testing includes the testing of bores, broach slots, bolt holes, webs, scallops, and blades. Specifications include the following: • Four-axis scanner • Linear X-axis motion over 17” • C-axis motion—continuous 360° • Data acquisition—16 bit with 8 differential inputs and a maximum sampling rate of 50 K/sec • Linear R-axis motion up to 5.8” • C-axis resolution - 0.01" • X- and R-axis resolution—0.001” Charlie Chong/ Fion Zhang
Page 1 and 2:
Electromagnetic Testing Chapter 3-
Page 3 and 4:
Submarine Applications Charlie Chon
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Fion Zhang at Shanghai 6th April 20
Page 13 and 14:
IVONA TTS Capable. Charlie Chong/ F
Page 15 and 16:
Chapter 3. ELECTROMAGNETIC TESTING
Page 17 and 18:
Barkhausen effect The Barkhausen ef
Page 19 and 20:
Barkhausen Noise Charlie Chong/ Fio
Page 21 and 22:
Figure 3.1 Eddy current principle.
Page 23 and 24:
Figure 3.2 Schematic diagram of bas
Page 25 and 26:
Figure 3.3 The effect of conductivi
Page 27 and 28:
Figure 3.3 The effect of conductivi
Page 29 and 30:
Another important influence on coil
Page 31 and 32:
If the conductivity of the material
Page 33 and 34:
Figure 3.5 The effect of a crack on
Page 35 and 36:
FIGURE 8-49 Conductivity curve: (a)
Page 37 and 38:
So far, we have described how eddy
Page 39 and 40:
Figure 3.6 The effects of (a) condu
Page 41 and 42:
3.1.2 Limiting Frequency f g of Enc
Page 43 and 44:
Figure 3.7 The effect of degree of
Page 45 and 46:
Charlie Chong/ Fion Zhang
Page 47 and 48:
Eddy Current Heating Charlie Chong/
Page 49 and 50:
Eddy Current Heating Charlie Chong/
Page 51 and 52:
Eddy currents weaken the original m
Page 53 and 54:
3.2 MAGNETIC FLUX LEAKAGE THEORY Wh
Page 55 and 56:
3D Magnetic Field Charlie Chong/ Fi
Page 57 and 58:
3D Magnetic Field Fig.1 THE PRINCIP
Page 59 and 60:
Based on what we have learned about
Page 61 and 62:
Charlie Chong/ Fion Zhang Figure 3.
Page 63 and 64:
Magnetic Field - Simple Semi Ellipt
Page 65 and 66:
Flux leakage sensors have small dia
Page 67 and 68:
The frequency of the alternating fi
Page 69 and 70:
Figure 3.14 Rotating magnet arrange
Page 71 and 72:
3.3 EDDY CURRENT SENSING PROBES For
Page 73 and 74:
As the probe moves over the defect,
Page 75 and 76:
Figure 3.17 Differential surface co
Page 77 and 78:
Figure 3.19 shows an encircling coi
Page 79 and 80:
The application of eddy current sen
Page 81 and 82:
Baffles and tube sheets. Charlie Ch
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Another important consideration for
Page 91 and 92:
3.4.1 Induction Coils For an induct
Page 93 and 94:
If the diameter of a surface coil i
Page 95 and 96:
3.4.2 Hall Effect Sensors Hall effe
Page 97 and 98:
Figure 3.21 illustrates the Hall ef
Page 99 and 100: Hall voltage Charlie Chong/ Fion Zh
Page 101 and 102: Since a 1 gauss (G) field produces
Page 103 and 104: Figure 3.22 Effect of magnetic fiel
Page 105 and 106: 3.5 FACTORS AFFECTING FLUX LEAKAGE
Page 107 and 108: Defect & Flux Distribution Charlie
Page 109 and 110: The distance between adjacent defec
Page 111 and 112: 3.6 SIGNAL-TO-NOISE RATIO The signa
Page 113 and 114: With flux leakage testing, signal-t
Page 115 and 116: As shown in Eq. (3.6), test frequen
Page 117 and 118: The characteristic frequency for a
Page 119 and 120: Charlie Chong/ Fion Zhang
Page 121 and 122: Figure 3.23 Magnetization or magnet
Page 123 and 124: By taking the product of B and H fo
Page 125 and 126: The rate of change of the opposing
Page 127 and 128: Figure 3.25 Encircling coils establ
Page 129 and 130: Figure 3.27 DC-MFL sensor illustrat
Page 131 and 132: Fill factors apply only to encircli
Page 133 and 134: For best results with encircling co
Page 135 and 136: 3.11 INSTRUMENT DESIGN CONSIDERATIO
Page 137 and 138: Charlie Chong/ Fion Zhang Figure 3.
Page 139 and 140: TABLE 3.2. Comparison of Instrument
Page 141 and 142: Some general categories of equipmen
Page 143 and 144: Figure 3.29 UniWest-454 EddyView mu
Page 145 and 146: Scanner operation uses a separate c
Page 147 and 148: Figure 3.30 E-Lab model US-450 full
Page 149: 3.12.3 ETC-2000 Scanner Because of
Page 153 and 154: 3.13 INSTITUT DR. FOERSTER Institut
Page 155 and 156: It is possible to provide 100% eddy
Page 157 and 158: Figure 3.33 ET testing of hot coppe
Page 159 and 160: For maximum sensitivity, the Circog
Page 161 and 162: 3.14 MAGNETIC FLUX LEAKAGE TESTING
Page 163 and 164: ASTM E 570 describes magnetic flux
Page 165 and 166: Charlie Chong/ Fion Zhang Figure 3.
Page 167 and 168: Applications involving physical par
Page 169 and 170: Inexpensive 60 Hz eddy current comp
Page 171 and 172: 4. Measure the length of nonwelded
Page 173 and 174: Some general applications for the f
Page 175 and 176: Permanent magnets are the preferred
Page 177 and 178: Robot Charlie Chong/ Fion Zhang
Page 179 and 180: 3.17.1 Introduction In 1911, Dr. He
Page 181 and 182: 3.17.2 Early Applications Stresses
Page 183 and 184: Typical roll failures are caused by
Page 185 and 186: This technique has been found to be
Page 187 and 188: Figure 3.38 A comparison of Barkhau
Page 189 and 190: Figure 3.39 Three-channel Rollscan
Page 191 and 192: The appropriate depth of measuremen
Page 193 and 194: 3.17.5 Calibration and Testing Bark
Page 195 and 196: Comparative studies by Kirsti Titto
Page 197 and 198: 3.17.6 Current Applications Barkhau
Page 199 and 200: 3.17.9 Pipe/Tubing/Sheet/Plate Manu
Page 201 and 202:
EMATs overcome many common ultrason
Page 203 and 204:
3.18.1 EMATs Advantages Over Piezoe
Page 205 and 206:
3.18.3 Recent Applications And Deve
Page 207 and 208:
Figure 3.44 Courtesy of Weld Inspec
Page 209 and 210:
3.19 ALTERNATING CURRENT FIELD MEAS
Page 211 and 212:
3.19.1 Acfm Principles Of Operation
Page 213 and 214:
Figure 3.45 Current flow and induce
Page 215 and 216:
3.19.2 Bx and Bz Components The pre
Page 217 and 218:
3.19.3 Butterfly Plot To aid interp
Page 219 and 220:
3.19.4 Probe Design Standard ACFM p
Page 221 and 222:
Figure 3.48 Flowchart selection of
Page 223 and 224:
3.31 APPLICATIONS One active encode
Page 225 and 226:
Other applications include: • Ins
Page 227 and 228:
Eddy Current Testing at High Temper
Page 229 and 230:
Good Luck Charlie Chong/ Fion Zhang
show all

Electromagnetic Testing Chapter 3- Electromagnetic Testing

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?