Magnetoscopic examination is a control that is applied on ferromagnetic materials to detect superficial or sub-superficial discontinuities. The ability to detect superficial imperfections or just below the surface (max few mm) depends on the equipment and technique used.
It consists in creating a magnetic field in the piece, after which, in correspondence of discontinuity the field is deviated thus forming a dispersed flow. These deviations in the magnetic field are highlighted with magnetic dust which is applied to the magnetized area and which accumulates at the indication making it visible and measurable.
Equipment we have are:
- Permanent magnet (C-shaped magnet) for field inspections on areas that are not particularly extensive and in particular when it is difficult to have an electrical outlet.
- Electromagnets, (commonly called “yokes”), portable devices that require power supply and create the magnetic field by alternating current (AC) or rectified (DC). Mainly used for welding checks.
- Magnetic Bench, fixed position for checking parts of limited dimensions and weights, usually bars, bolts, threaded rods, etc.
We have all sets of certified sample weights (depending on the standard and testing technique) for checking the lifting power of permanent or electromagnetic yokes.
The consumable we use are always certified products; depending on the type of control they can be:
- Colored dry powders (blue, red, yellow) that are used in normal lighting conditions.
- Black magnetic particles in liquid suspension (kerosenoil or water) that are used in normal lighting conditions.
- Fluorescent magnetic particles (dry powders or liquid suspension), which require a darkened environment for the inspection and use of black light lamps called “Wood lamps”.
The main applications of our competence are:
- Checks with magnetic yokes during the welding process: MT on bevels, MT on intermediate passes (less frequent), finished welding, repaired areas, etc.
- Checks with manual yokes on in-service structures as part of periodic checks on overhead cranes, cranes, storage tanks, pressure vessels.
- Controls on manufactured items or castings, usually with fluorescent particles.
- Controls using a magnetic bench on small pieces such as bolts, pins, threaded screws, valves, etc. usually with fluorescent particles.
The staff is certified ISO 9712 or SNT-TC-1A liv.2 and liv.3.
We naturally have the necessary Luxometers and Radiometers certified for the measurement of light intensity and UVA rays
