Clean area to be tested
Apply contrast paint
Apply magnetism to the component
Interpret the test area
Post clean and de-magnetize if required
Apply Ferro-magnetic ink to the component during magnetizing
Surface and slight sub-surface detection
Relies on magnetization of component being tested
Only Ferro-magnetic materials can be tested
A magnetic field is introduced into a specimen being tested
Methods of applying a magnetic field, yoke, permanent magnet, prods and flexible cables.
Fine particles of iron powder are applied to the test area
Any defect which interrupts the magnetic field, will create a leakage field, which attracts the particles
Any defect will show up as either a dark indication or in the case of fluorescent particles under UV-A light a green/yellow indication
Simple to use
Inexpensive
Rapid results
Little surface preparation required
Possible to inspect through thin coatings
Surface or slight sub-surface detection only
Magnetic materials only
No indication of defects depths
Only suitable for linear defects
Detection is required in two directions
