Magnetic Particle Testing (MT)
In Magnetic Particle Test the ferromagnetic part is magnetized in desired direction.
Finely milled iron particles applied on the surface of specimen.
These particles are attracted to magnetic flux leakage fields and will cluster to form an indication
directly over the discontinuity.
This indication can be visually detected under proper lighting conditions.
Magnetic particle testing is a non
destructive testing method for detection of surface and near surface
discontinuities in ferromagnetic materials.
Applicable only to Ferromagnetic materials, Iron, Cobalt, Nickel and their magnetic alloys.
Detection sensitivity diminishes rapidly with depth.
If the flaw is in surface it must be produce larger indication.
Deeper flaws produce broad and fuzzy indication which require careful interpretation.
Magnetic Particle Test Methods as below:-
|Circuler Magnetization||Longitudinal Magnetization||Torodail Field|
|A) Head Shot Methods||A) Coil Methods||A) Induce Current Magnetization|
|B) Central Conductor Method||B) Electromagnetic Yoke|
|C) Prod Method||C) Permanent Magnet|
|Magnetic Particle Test||MT Level I||03 Days||20 Hours||General||40 Questions|
|Magnetic Particle Test||MT Level II||05 Days||40 Hours||General||40 Questions|