eddy current testing parte 1.1

8/21/2019 Eddy Current Testing Parte 1.1

1/3

v i

CHAPTER S - TESTING WITH SURFACc PROBES

S

.1

S .

2

S. 3

S.

4

S.

S

S.

6

5 7

S. 8

S.9

S.

10

S.11

INTRODUCTION

SURFACE PROBES

S. 2.1

S .

2 . 2

Probe Types

Direc t iona l P roper t i e s

5 . 2 . 2 . 1 Se ns i t i v i t y a t Centre of a Coi

S. 2 .

3

Probe Induc tance

PARAMETERS AFFECTING SENSITIVITY

TO

DEFECTS

S.

3.

1

5 . 3. 2

Se ns i t i v i t y with

L i f t

- off and Defect Depth

Et fec t of Defec t Length

COMPARISON BETWEEN SURFACE

ANO

THROUGH WALL INSPECTION

IMPEDANCE

GRAPH DISPLAY

S . S . 1 Ef fe

e

t

of

R e s i s t i v i t y

S .S

. 2

Ef fec t of

Perrueabi1i ty

5.

5.

3

Ef fe e t of

Thickness

S .S

. 4

Ei fec t

of

r ~ q u e n c y

S . S . S Effec t

of P

robe

Diameter

S.S .

6

Comparison

of Exper imenta l

Impedance Oi ag

rams

CHARACTERISTIC

PARAMETER

DEFINITlON

OF

PHASE TERMINOLOGY

SELECTION OF TEST FREQUENCY

Inspec t ing fo r Defec t s

Measuring

Res i s t i v i ty

Measuring

Thickness

and

Coruputer

S.

8 . 1

S .

8 .

2

S 8 3

S . 8 . 4

Measuring Thickness

of

a Non- conduct ing

Layer

on a Conductor

S. 8 .

S

e a ~ u r i n g Thickness of

a

Conducting Layer

on

a Conductor

PROBE-CABLE RESONANCE

SUMMARY

WORKED EXAMPLES

5 .11 .1

Effec t ive Probe Diameter

5 . 11 .2

C h a r a c t e r i s t i c

Parameter

PAGE

55

55

56

59

60

61

65

65

66

67

69

72

72

72

72

73

73

74

77

78

78

80

83

84

84

85

86

88

88

88


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-

-

v i i

-

CHAPTER 6 - SURFACE

PROBE

S GNAL ANALYSIS

6 . l

6.2

INTRODUCTION

EOOY

CURRENT SIGNAL CHARACTERISTICS

6 . 2 1

6 . 2 . 2

Oetect Signa Amplitude

Oefect Signa Phase

PAGE

89

89

89

l

6.3

EFFECT

OF

MATERIAL VARIAT ONS

ANO

DEFECTS

IN

A

FlNIIE

THICKIN ESS 93

6.4 COIL IMPEDANCR CHANGES WITH

DEFECTS

97

6 .

5

6 . 6

6.7

6 .

4 .1

6 . 4 . 2

Surface Defect

Measurement

Subsurface Oefect Measurement

COIL IMPEOANCE CHANGES WITH

OTHER

VARIABLES

6 .

5

.1

6 .

5.

2

6.

5 .

3

Ferromagnet ic

Ind i ca t ions

E l e c t r i c a l R e s i s t i v i t y

Signa ls from Changes

in

Surface Geometry

CALIBRATION DEFECTS

SUMMARY

97

97

98

98

lOO

lOO

101

104

CHAPTER 7 - TESTING OF TUBES

ANO

C Y L I N D ~ I C L COMPONENTS

7

.1

7 .

2

7.

3

7.4

7.

5

7.6

7 . 7

INTRODUCTION

10

5

105

ROBES

FOR

TUBES

ANO

CYLINDRICAL

COMPONENTS

7 . 2

.1

7 .

2 . 2

7 .

2 .

3 .

7. 2.

4

7 . 2 . 5

Probe Types

Comparing Oif fe ren t i a1 and Abso1ute

Probes

Oirec t iona l P rope r t i e s

Probe

Inductance

Probe

-

Cab1e

Resonance

lOS

10

7

1 9

u o

112

IMPEDANCE

PLANE

DIAGRAMS

113

7 .

3 .

1

7. 3 . 2

7.

3. 3

7 . 3 . 4

So1id

Cy1inders 1 5

7.3 .1 .1 S e n s i t i v i t y in Centre of

a

Cy1inder 116

Tubes 118

Char ac te r i s t i c Frequency

for

Tubes 120

Computer Generated Impedance Oiagrams 122

CHOICE OF TEST FREQUENCY

12 3

7.

4 .

1

7 . 4 . 2

Test

Frequency

for

So1id Cy1inders

Test Frequency

for

Tubes

23

124

PROBES FOR DETECTING CIRCUMFERENTIAL CRACKS 125

S UMMARY 12 8

WORKED EXAMPLES 129

7 .7 .1 Ca1cu1ate

f / fg to

oper a t e a t

knee

1ocat ion ,

for

a

cy1 inder

29

7.7 .2

(a) Ca1cu1ate optimum t e s t frequency for tube

i n spec t i on

129

(b)

Determine oper a t i ng

po in t

fo r above

f requency 130

(e) Ca1cu1ate f requency to d i sc r imina t e fe r ro

-

magnet ic

i nd i ca t ions

130

#


3/3

- -

CHAPTER 8 -

TUBE

TESTING - SIGNAL ANALYSIS

8 .

8 . 2

8 .3

8 .4

8.5

P GE

INTR00UCTION 131

131

DDY CURRENT SIGNALS

8 .

2

.1

8 . e

2

8 .

2 .

3

8 .

2. 4

8.2 .5

8 . 2. 6

Defect

Signa

Ch a ra c te r i s t i c s

131

Effec t of

Test

Frequency

135

Ca l ib ra t io n Tubes and Simple e f ~ c t s 138

Ve

c

t o r i a l

Addi t ion and

Defec ts a t B af f l e

Pla te s 142

Tube In spec t i on

a t Tubesheets 146

T es t i ng

Tubes

with

I n t e r n a l

Surface Probes 147

NOM LOUS

EDDY CURRENT SIGNALS

149

8 .

3.1

8 . 3. 2

Ferromagnet ic

Inc1us ions and

Deposi ts

Conducting Depos i t s

MULTIFREQUENCY EDDY

CURRENT

TESTING

8 .4 .1

8 . 4 .

2

SUMM RY

Backgro

u

nd

Mu1tif requency Tes t ing of

Dented

Tubes

149

153

155

15)

158

162

CHAPTER 9 - METALLURGICAL PROPERTIES NO TESTING FERRO

M GNETIC

MATERIALS

9 .

1

9 .

2

9 .

3

9 . 4

9.5

9 . 6

INTRODUCTION

ELECTRICAL CONDUCTIVITY

9 . 2.1

9 . 2 .

2

Factors Affec t ing R e s i s t i v i t y

Mater i a l

Sor t i ng by

Res i s t i v i t y

M GNETIC PROPERTIES

9 . 3

.1

9 .3 .2

9 .

3.

3

Magnetic Hyste res i s

Magnetic Permeabi1i ty

Factors A ffec t i ng Magnet ic P ~ r m e a b i i t y

TESTING

M GNETIC

MATERIALS

9 . 4

.1

9 .4 .2

9 . 4 . 3

9. 4 .

4

SUMM RY

Simpl i f i ed

Impedance Oiag rams

Impedance Diagrams

M

a t e r i a l

Sor t i n g by

Magnetic

P ~ r m e a b i i t y

Test ing fo r Defects in Magnetic Mat e r i a l s

WORKED

EX MPLES

9 .

6 .

1

9 . 6 . 2

9 .6 .3

Calcu1ate

Conduc t iv i ty

Ca1cula te Magnetic

P e r ~ e a b i i t y

Calcu la t e

Standa rd Depth

o t

Pene t r a t i on

CHAPTER lO - DEFINITIONS, REFERENCES NO

INDEX

lO

. 1

10 . 2

10 .3

DEFINI fiONS

REFERENCES

INDEX

. .

16

3

163

16 3

166

16 8

169

17 o

172

74

174

17 6

178

178

184

18 5

185

18 5

186

187

19 4

1 :15

eddy current testing parte 1.1

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