• First NDT Training Institute in Pondicherry

    SHRI SAI INSTITUTE OF NON-DESTRUCTIVE TESTING & INSPECTION SERVICES is a leading training institute for ASNT level I & level II . We offer a course which provides 100% job opportunities in India and abroad with attractive salary and high reputation.

  • Testing Methods

    WE offer courses on ASNT Level I and Level II in Radiographic Testing,Ultrasonic Testing,Visual Testing,Magnetic Particle Testing,Liquid Penetrant Testing,Radiographic Film Interpretation and also we provide Free courses on Welding Inspection & Training ,Quality Practice and Leak Testing

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About Ultrasonic Testing

Ultrasonic inspection is a non-destructive method in which high frequency sound waves are introduced into the material being inspected. Most ultrasonic inspection is done at frequencies between 0.5 and 20 MHz, well above the range of human hearing which is about 20 Hz to 20 kHz. The sound waves travel through the material with some loss of energy (attenuation) due to material characteristics. The intensity of sound waves is either measured, after reflection (pulse echo) at interfaces (or flaw) or is measured at the opposite surface of the specimen (pulse transmission). The reflected beam is detected and analyzed to define the presence and location of flaws. The degree of reflection depends largely on the physical state of matter on the opposite side of the interface, and to a lesser extent on specific physical properties of that matter, for instance, sound waves are almost completely reflected at metal-gas interfaces. Partial reflection occurs at metal-liquid or metal-solid interfaces. Ultrasonic testing has a superior penetrating power than radiography and can detect flaws deep in the test specimen (say up to about 6 to 7 metre of steel). It is quite sensitive to small flaws and allows the precise determination of the location and size of the flaws


Ultrasonic testing method is:

(1) Mostly used for detection of flaws in materials.

(2) Widely used for thickness measurement.

(3) Used for the determination of mechanical properties and grain structure of materials.

(4) Used for the evaluation of processing variables on materials.


 
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