BlackWing MK 2013 Manual de usuario descargar pdf (Pagina 5)

SECTION 2

Magnetic Flux Leakage

This equipment uses Magnetic Flux Leakage as a detection tool. The powerful magnetic

bridge introduces a magnetic flux into the material to be inspected. The strength of the

magnetic bridge allows for near saturation of the inspected material. Any localized reduction in

the thickness of the inspected material will result in a flux leakage at the surface. A series of

sensors are placed between the poles of the magnetic bridge to detect these leakage fields.

The strength of the leakage field is a function of volume loss and is not a reliable indication of

remaining wall thickness. Although the amplitude of the signal generated by the sensors gives

some relative severity information, it is not recommended that amplitude alone be used for

accept/reject criteria purposes. Flux leakage should only be used as a detection tool.

Quantitative information can only be obtained using ultrasonic assessment of the areas

identified by the magnetic flux leakage scanner.

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BlackWing MK 2013 Manual de usuario Pagina 5