Ultrasonic flaw detector- Study Material
Ultrasonic wave ® are used to detect surface and internal faults (such as cracks, cavities, presence of foreign objects etc.) in materials, castings, wildings. Ultrasonic’s is also used to assess the continuity of composite materials such as reinforced plastics and adhesive bonding.
Ultrasonic flaw detector – Study Material
Synopsis
- Ultrasonic methods of non-destructive testing
- Advantages of Ultrasonic testing
- Disadvantages of ultrasonic testing
Ultrasonic methods of non-destructive testing:
Ultrasonics is also used to assess the continuity of composite materials such as reinforced plastics and adhesive bondings. In ultrasonic flaw detection, the frequency range commonly used in 1-15 MHz. Ultrasonics can propagate only through an elastic] medium and there must be continuous mechanical coupling. When an ultrasonic wave strikes an interface between two media it is partly reflected.
Advantages of Ultrasonic testing :
- Deep seated detects in metals can be located.
- Minute flaws can be detected.
- Location, nature and size of a defect can be accurately determined.
- Disadvantages of ultrasonic testing:
- No permanent record (photograph) of the flaw can be obtained, as it can only be observed on the screen of CRO.
- Only skilled and well-trained technicians can perform this testing.
- There should be good mechanical coupling b/w the crystals (called probe) and specimen to be tested.
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