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In angle beam mode, ultrasonic examination can detect crack like defects down to less than 1 mm in size and can be used to size cracks down to less than 3 mm. It is probably the most versatile of the inspection techniques and used routinely as an inspection tool. 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. This is used for surface crack detection, particularly in weldments.Ī direct current passed through the component creates positive and negative poles on either side of a crack. 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. It is not suitable for detecting planar defects such as cracks. Radiography is normally only used during manufacture or construction because of access and safety issues. This is used for detecting internal defects in, e.g., pipe walls.Ī radiation source is placed inside the pipe and film is wrapped around the outside.
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The frequency of examination and the percentage coverage will be a function of the age of the component and past experience of cracking or damage of the component type.
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These are routinely applied at inspection intervals throughout the life of a component and form an indispensable part of a life assessment program. The noise from the thermogram becomes more visible.
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Geometry Surveying System instrumentation and control in jan 2012.Īre you a researcher To avoid being denied access, log in if youre a ResearchGate member or create an account if youre not.įirst, a Sobel filter is applied and, by selecting a threshold value, all information is reduced to a binary mask, Fig.
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