correct-application-of-non-destructive-testing-iPenetrant testingUltrasonic testing Unfavorable structure Distance from surface Unfavorable contour/locationPorous No wetting Fouling Pressed shutGaping Filled Smeared shut Grooves X-ray testingUnfavorable locationInterfering microstructureFlaws too small (depending on cross-section)Magnetic crack detectionUnfavorablecontourNon-magneticmaterialEddy current testingUnfavorable surfaceInhomogeneousmicrostructure Inhomogeneous coatings