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"Reducing Measurement Error in Wet MPI of Metal Castings" Webinar Recording

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This webinar covers measurement variability due to surface roughness, geometry, and human operators in wet magnetic particle inspection (MPI) of metal castings. Steel castings have rougher surfaces than machined parts, which makes this an important factor to investigate because unevenness on the surface causes the particles to collect and may result in false positives or prevent the human operator from finding true defects. An advantage of castings is their complex geometries; however, this geometry creates a variance in the magnetic field strength on the part. If a process is not properly set up to account for the effect of geometry on the magnetic field strength, the discontinuities may not be identified in regions where the magnetic field strength is low. Lastly, a gauge repeatability and reproducibility (R&R) study was performed in three foundries to investigate the human error in wet MPI. The R&R results were reported as the “percent of matches.”

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