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  Range and Sensitivity Setting  for Ultrasonic testing Setting of range and sensitivity shall be carried out prior to each testing in according to this procedure. The temperature difference between the time of range and sensitivity setting and time of test should be within ± 15°C. Checks to confirm these settings shall be performed at least 44 hour once and on completion of tests. The checks should also be done whenever a system parameter is changed. If deviations are found during these checks , corrections given in the below Table. 1 shall be carried out. Reference for Sensitivity Setting for Ultrasonic Testing One of the following technique shall be used for setting of reference Technique 1:  The reference is a Distance Amplitude Curve (DAC) from a dia 3mm side drilled hole. Technique 2:  The references for transverse and longitudinal waves using the distance gain size technique (DGS) based on the diameter of the disk shaped reflector (DSR) are given in the table ...

 A study on the couplant effects in contact ultrasonic testing. The primary purpose of a couplant is to provide a suitable sound path between the transducer and the test surface.Ultrasonic Testing couplants usage can be seen here A couplant must effectively wet or totally contact both surfaces of the transducer and the test part. The couplant must exclude all air from between the surfaces as air is a very poor conductor of sound. The couplant fills in and smoots out irregularities on the surface of the part. The couplant aids in the movement of the transducer over the surface in contact testing. The practical couplant must be easy to apply and easy to remove. It must also be harmless to the part surfaces. How to Pick the Right Ultrasonic Couplant for Your Application? Oil or water mixed with Glycerin (2 parts water and 1 Part glycerin) are commonly used couplants. Even wallpaper paste has advantages as couplant. Heavier couplants, such as Grease or heavy Oil can be ...

 This blog will discuss types of discontinuities that can be evaluated with the ultrasonic testing in NDT method. Discontinuities can be divided into three general categories inherent, processing and service Inherent discontinuities are usually formed when the metal is molten. Inherent wrought discontinuities relate to the melting and solidification of the original ingot before it is formed into slabs, blooms and billets. Inherent cast discontinuities relates to the melting, casting and solidification of a cast article. Usually caused by inherent variables such as inadequate feeding, gating, excessive pouring temperature or entrapped gases. Processing discontinuities are usually related to the various manufacturing process such as machining, forming, extruding, rolling, welding, heat treating and plating. Service discontinuities are related to the various service conditions such as stress, corrosion, fatigue and erosion. During the manufacturing process, many d...