L2 OVERVIEW OF MAGNETIC PARTICLE TEST

1. OML751 TESTING OF MATERIALS
ME8097 NON DESTRUCTIVE TESTING
AND EVALUATION
M.KARTHIKEYAN
ASSISTANT PROFESSOR
DEPARTMENT OF MECHANICAL ENGINEERING
AAA COLLEGE OF ENGINEERING & TECHNOLOGY, SIVAKASI
karthikeyan@aaacet.ac.in

2. UNIT I OVERVIEW OF NDT
1. NDT Versus Mechanical testing & Overview of Liquid penetrant
test
2. Overview of Magnetic particle test
3. Overview of Thermography test
4. Overview of Eddy current test
5. Overview of Ultrasonic test
6. Overview of Acoustic emission test
7. Overview of Radiographic test
8. Various physical characteristics of materials and their
applications in NDT.,
9. Visual inspection – Unaided and aided.

3. MAGNETIC PARTICLE TESTING
PRINCIPLE:

4. INSPECTION PROCEDURE:
 Magnetize the component
 Leakage field will be formed at the surface defects area
 Iron particles either in a dry or wet suspended form are
applied to the surface of the component.
 Now the iron particles will be attracted and cluster at the flux
leakage fields.
 Finally the inspector will easily identify the crack.

5. ADVANTAGES:
 High sensitivity
 Indication are produced directly on the surface of the
component
 Minimal surface preparation
 Portable
 It is quick and relatively uncomplicated
 The method can be adapted for site or workshop use
 It is inexpensive compared to radiography
 Large or small objects can be examined
 Less training requirements.

6. LIMITATIONS:
 Only surface and near surface defects can be detected
 Only non-porous surface can be inspected
 Only applicable to ferromagnetic materials.
 Need a supply of electricity
 Parts must be demagnetized and cleaned after inspection.

7. PART - B
1. Explain the sequence of operations of magnetic particle testing
QUESTIONS