Magnetic Particle Inspection, Level I and Level II

Why does a magnet stick to some refrigerators but not others? It doesn’t have to do with the magnet, it has to do with the refrigerator. Some doors are iron based, and some aren’t. When we are inspecting for surface breaking discontinuities, volumetric methods like radiography or ultrasonics may not detect the imperfection if it’s too small or orientated incorrectly. Couple that with the material being ferromagnetic (iron based) and we have a great use for magnets, or magnetic fields.

Magnetic particle inspection is a very good method at finding small surface and near surface discontinuities that may be otherwise missed. It relies on an uninterrupted magnetic field being interrupted by the discontinuity. When this does occur, we can apply a light dusting of ferromagnetic particles, and the particles will be attracted to the interrupted areas and will be held there. If the particles are colored with a high contrast pigment, they become readily visible.

Learn how to apply this important method and the limitations of use by attending a magnetic particle inspection course hosted by ND³ today.

Subjects Covered:

1. Principles of Magnets and Magnetic Fields
2. Characteristics of Magnetic Fields
3. Effect of Discontinuities of Materials
4. Magnetization by Means of Electrical Current
5. Selecting the Proper Method of Magnetization
6. Inspection Materials
7. Principles and Process of Demagnetization
8. MT
9. Types of Discontinuities Detected by MT
10. Magnetic Particle Test Indications and Interpretations
11. Flux Fields
12. Equipment
13. Inspection and Evaluation of Indications
14. Inspection Procedures and Standards
15. Quality Control of Equipment and Processes

Subjects taken from ASNT CP-105 as the basis for course subject matter. Additional subject material may be presented for clarification, requirement changes, or student/employer addition based upon specific need.