Magnetic flux leakage detects discontinuities..
Prods, yokes, coils suitable for inducing magnetism into the weld. Power source (electrical). Magnetic powders. Some application require special facilities and ultraviolet lights.
Most weld discontinuities open to the surface – some large voids slightly sub surface .Most suitable for cracks.
Relatively economical and expedient, Inspection equipment is considered portable. Unlike dye penetrants, magnetic Particle can detect some discontinuities lightly below the surface. Can be used for higher temperatures.
Applicable only to ferromagnetic material. Parts must be cleaned before and after inspection. Thick coatings may mask reject able discontinuities. Some applications require parts to be demagnetized after inspection. Magnetic particle inspection requires use of electrical energy for most applications...
KOLKATA NDT EXCELLENE CENTRE -
Garia station, Uttarpara, Nabapally, PS :Narendrapur, PO: Dhalua, Uttarpara main road, Land mark: Between Balok sanghya club and Biharir Dokan. Exactly besides of Biharir Dokan. Kolkata-700152