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This method is widely used to examine for subsurface discontinuities (such as voids, porosity, inclusions and cracks, etc.) in castings and weldments in a wide range of materials, by using the technique of radiographic exposure and interpretation of radiographic film. The interpretation of radiographic film requires knowledge of not only welding and welding discontinuities, but also of the acceptance criteria of the various codes and standards used in the industry. 

At NDTL our ASNT Level II Radiography Technicians have extensive knowledge and experience in performing these exposures safely, and are certified to interpret these films to the required codes and standards. NDTL also has a certified Level III on staff.





Ultrasonic testing is another method of non destructive testing where a transducer applies ultrasonic pulse waves in the frequency range of 0.5 to 10MHz in the material and the time of flight of the ultrasonic waves is measured from the initiation time to the return of the reflection to the transducer. Any change in acoustic impedance produces ultrasonic reflection or echo. 
This property of the ultrasound is used to identify the material wall thickness and any internal discontinuities in material. 

Ultrasonic testing is a very sensitive test method for detection of embedded discontinuities. Ultrasonic testing is faster and economical as compared to radiographic examination and requires a trained and experienced operator. The common applications of ultrasonic testing are wall thickness measurement, corrosion mapping, lamination testing, flaws in welds, castings, forgings and other wrought products.

NDTL offers a range of high quality, accurate and calibrated portable Ultrasonic Testing equipment for thickness and flaw detection applications.

Last modified on Saturday, 28 March 2015 19:56
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