Overview
Magnetic Particle Testing (MT) involves detection of surface and subsurface (upto 5 mm
deep) defects in ferromagnetic materials. MT involves magnetization of ferromagnetic
components. Once the component is magnetized, magnetic particles can be sprinkled
on the component. They align themselves along any defects that may be present on the
surface. An important thing to note is that, unless heat treatment is to be carried out
after MT, or if any machining work is to be done, the parts must be thoroughly
demagnetized. Also, note that testing has to be carried out in two (2) directions
90 o apart so as to have complete coverage of the specimen. MT can be further divided
into the following methods: Visible and Fluorescent
