Magnetic Particle Testing:

A quick and reliable technique for detection and location of cracks on or just below the surface of ferrous metals. A magnetic flux is applied to the specimen, either locally or overall, using a permanent magnet, electromagnet, flexible cables or hand-held prods. Magnetic particles distributed over the component will be attracted to areas of flux leakage and produce a visible indication.

Visual Testing: (VT)

One of the most widely used Non-Destructive (NDT) methods for the detection of discontinuities before they cause major problems. It is easily carried out, inexpensive and usually doesn’t require special equipment.