Magnetic particle testing (MT)
Magnetic particle testing (MT) techniques allows detecting surface imperfections in ferromagnetic forgings, castings and welds, including the heat affecting zones. It can also detect imperfections below the surface on 3 mm depth. This method is suitable for most welding processes and joint configurations. When the magnetic field encounters a discontinuity transverse to the direction of the magnetic field, the flux lines produce a magnetic flux leakage field of their own. Because the air doesn’t conduct magnetic flux lines, the colored ferromagnetic particles will be drawn into the discontinuity, reducing the air gap and producing a visible indication on the surface of the part. The use of alternating current gives the best sensitivity for detecting surface imperfections. We are using certified alternative current hand yokes.