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Magnetic Particle Testing Lecture Guide l CONTENTS
Disadvantages of Longitudinal Magnetization ..........................................13
Multidirectional Magnetization ..........................................................13
Test Materials .........................................................................14
Wet Particles ......................................................................14
Dry Particles .......................................................................14
Lesson 3 Quiz .........................................................................15
Lesson 4: Principles of Demagnetization ...................................................17
Introduction ..........................................................................17
Alternating Current Demagnetization ....................................................17
Direct Current Demagnetization .........................................................17
Efficiency of Demagnetization ...........................................................17
Reasons for Demagnetization ...........................................................18
Reasons Not to Demagnetize ...........................................................18
Batch Demagnetization ................................................................18
Lesson 4 Quiz .........................................................................19
Lesson 5: Equipment ...................................................................21
Equipment Selection ...................................................................21
Purpose of Test .....................................................................21
Area Tested .......................................................................21
Particles Used ......................................................................21
Mobile Equipment .....................................................................22
Stationary Testing Equipment ............................................................22
Automated Equipment ..............................................................22
Medical Safety Considerations ..........................................................22
Lesson 5 Quiz .........................................................................23
Lesson 6: Discontinuities ................................................................25
Introduction ..........................................................................25
Inherent Discontinuities .................................................................25
Processing Discontinuities ...............................................................26
Primary Processing Discontinuities ....................................................26
Rolling and Extruding Discontinuities ...............................................26
Forging Discontinuities ...........................................................26
Welding Discontinuities ...........................................................26
Secondary Processing Discontinuities ..................................................26
Inservice Discontinuities .................................................................27
Summary .............................................................................27
Lesson 6 Quiz .........................................................................29
Lesson 7: Magnetic Principles ...........................................................31
Theories of Magnetism .................................................................31
Magnetic Flux Leakage .............................................................31
Magnetic Particle Testing Lecture Guide l CONTENTS
Disadvantages of Longitudinal Magnetization ..........................................13
Multidirectional Magnetization ..........................................................13
Test Materials .........................................................................14
Wet Particles ......................................................................14
Dry Particles .......................................................................14
Lesson 3 Quiz .........................................................................15
Lesson 4: Principles of Demagnetization ...................................................17
Introduction ..........................................................................17
Alternating Current Demagnetization ....................................................17
Direct Current Demagnetization .........................................................17
Efficiency of Demagnetization ...........................................................17
Reasons for Demagnetization ...........................................................18
Reasons Not to Demagnetize ...........................................................18
Batch Demagnetization ................................................................18
Lesson 4 Quiz .........................................................................19
Lesson 5: Equipment ...................................................................21
Equipment Selection ...................................................................21
Purpose of Test .....................................................................21
Area Tested .......................................................................21
Particles Used ......................................................................21
Mobile Equipment .....................................................................22
Stationary Testing Equipment ............................................................22
Automated Equipment ..............................................................22
Medical Safety Considerations ..........................................................22
Lesson 5 Quiz .........................................................................23
Lesson 6: Discontinuities ................................................................25
Introduction ..........................................................................25
Inherent Discontinuities .................................................................25
Processing Discontinuities ...............................................................26
Primary Processing Discontinuities ....................................................26
Rolling and Extruding Discontinuities ...............................................26
Forging Discontinuities ...........................................................26
Welding Discontinuities ...........................................................26
Secondary Processing Discontinuities ..................................................26
Inservice Discontinuities .................................................................27
Summary .............................................................................27
Lesson 6 Quiz .........................................................................29
Lesson 7: Magnetic Principles ...........................................................31
Theories of Magnetism .................................................................31
Magnetic Flux Leakage .............................................................31