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ITE provides NDT level II certifications as per SNT TC 1A of ASNT
When a specimen is magnetizedand magnetic lines of force (magnetic flux) are predominantly inside theferromagnetic material. The magnetic field introduced into the specimen iscomposed of magnetic lines of force. Whenever there is a flaw which interruptsthe flow of magnetic lines of force, some of these lines must exit and re-enterthe specimen. These points of exit and re-entry forms opposite magnetic poles.When minute particles are sprinkled onto the specimen, these particles areattracted by these magnetic poles to create a visual indication approximatingthe size and shape of the flaw. It is the abrupt change in permeability thatcauses this particle build up.
The magnetic particles can beapplied as powder or more commonly as liquid suspension usually known asmagnetic. To be detected, linear flaws such as crater crack must be favorablyoriented in relation to the direction of the magnetic field. The colour of themagnetic particles should be in good contract to the colour of the surface ofthe specimen for easy detection. For maximum sensitivity, the flux densityshould be oriented 90 degree to the discontinuity. However, it is generallypossible to detect flaw which lie up to Â± 45 degree to the direction of theflux lines. It is important to note that, because of the better sensitivity,when the discontinuity is at 90 degree to the lines of force, the magneticfield should be induced in several different directions when the possible flaworientations are not known.
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