Ultrasonic flaw detector is a kind of non-destructive testing ability with extensive application, high detection agility, and can detect tiny cracks
Release time:
2021-08-20
Metal ultrasonic flaw detector as a kind of non-destructive testing ability with extensive application, its important advantages are now: high detection agility, can detect tiny cracks; with large penetrating ability, can detect thick section castings. Its important scope lies in: it is difficult to deal with the reflection waveform of the disconnection defect of large surface size and poor directivity; dealing with unsatisfactory internal layout, such as grain size, structure layout, porosity, mixed content or small evacuation Precipitates, etc., also impede the waveform display; other tests must refer to the scale test block.
Due to the coarse grains of the casting, the poor sound permeability, the low signal-to-noise ratio, and the difficulty of flaw detection, when using a sound beam with high-frequency sound energy, the metal ultrasonic flaw detector can only encounter internal surfaces or defects during the transmission inside the casting. Breeding reflex and invention defects. The size of the reflected sound energy is a function of the directivity of the inner surface or defect and the acoustic impedance of the reflector. Therefore, various defects or the sound energy reflected by the inner surface can be used to detect the location of the defect, the wall thickness, or the subsurface defect depth.
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