Non-destructive testing (NDT) comprises a vast array of analytical techniques that are applicable to a wide range of industries. These techniques can identify and assess defects and examine the properties of all kinds of materials and structures without causing any damage. As NDT in no way alters the part or structure under inspection, an extremely useful technique can lead to cost and time savings when applied to product evaluations, asset management and fault identification and repair.
This method is used for examination of ferromagnetic material, both structural and non-structural carbon steel and low alloy steel welds, HAZ and parent material, production equipment, semi finished and machined surfaces.
Magnetic Particle Testing is done by inducing a magnetic field in a ferromagnetic material and dusting the surface with iron particles. Surface imperfections will distort the magnetic field an concentrate the iron particles near the imperfections, thus indicating their presence