[309] Strategies for defect sizing based on MFL signals and due to numerical simulation
I Perez-Blanco1, G Dobmann2, C Boller2 and J Panqueva-Alvarez1
1Corporación para la Investigación de la Corrosión (CIC), Colombia
2Saarland University, Germany
The magnetic flux leakage (MFL) technique using magnetic field-sensitive probes is a well-known method for inspection of large regions of interest on ferromagnetic materials such as steel sheets, plates and pipelines. However, increasing the accuracy in defect sizing based on MFL signals is still required by the industry. This paper presents calibration curves generated on a numerical basis and experimentally validated as a reliable strategy for defect sizing in case of corrosion wall-thinning defect types. Calibration curves are reported for magnetiser-near (ID) as well as -far (OD) defect configurations recognising discrepancies in their behaviour. Analysis of the probe lift-off as a crucial parameter on the
defect sizing is also reported, highlighting that its behaviour is non-linear.
