failed-detection-of-large-cracksCracks of a size thatis outside of the horizon of expectationare often overlooked. Why are apparently easily detectable cracks not found?Insufficient surface development, unsuitable pretreatmentMisinterpretation, insufficient expertiseUS transmitterand receiverFlaw oriented along the grain(segregation)Process-specific weaknesses, i.e. the process is not adapted or is not suitableGround galvanic Cr coatingCrack indicationsfrom magneticcrack detection