![]() Eddy current patterns due to the defects are detected using excitation/detection probes. ![]() It is routinely used as an inspection tool for detection of surface or subsurface defects. The surface is painted white and iron oxide powder sprinkled on, forming lines along the crack.Įddy current detection. A direct current passed through the component creates positive and negative poles on either side of a crack. This is used for surface crack detection, particularly in weldments. This technique is particularly useful in situations where direct access is limited but where a fluorescent liquid can be poured and the surface subsequently examined remotely using fiber optics. This is used for detecting surface cracking. It is not suitable for detecting planar defects such as cracks.įluorescent die penetration. Radiography is normally only used during manufacture or construction because of access and safety issues. A radiation source is placed inside the pipe and film is wrapped around the outside. This is used for detecting internal defects in, e.g., pipe walls.
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