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 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 ...

  Visual Testing in NDT: Visual Inspection is method of visually inspecting the material for deciding the acceptablility of the material. Infact it is the very first inspection method in Non Destructive Testing methods. Sometimes the Visual Inspection is carried out with aid of additional Instruments and Devices such as Measurement tools & Vision aids. What are essentials for visual Inspection ? Human Eye Lighting Acceptance Criteria Measurement Devices Human Eye So in order to make sure the very essential instrument (EYE) is working properly , it is essential to investigate and make sure, it works properly. So a Visual Acuity Test is recommended Yearly, by most of the standards Visual Acuity commonly referred to as clarity of Vision. It is dependent upon optical and neural factors. i.e., (i) the sharpness of the retinal focus (ii) the health and functioning of retina (iii) the sensitivity of the interpretative faculty of the brain. Vi...

 An Important principle of Radiography Testing procedure is How to arrange for Radiography Testing? Radiography is Non destructive testing method, which utilizes penetrating electromagnetic radiation for capturing the volumetric images of an object on film or digitally in a computer. Radiography testing broadly uses any of the two types of radiation X ray or Gamma Ray for this purpose. Gamma Ray Emitted from radio decaying isotopes. In this case radiation strength cannot be increased or decreased for purpose of inspection components of different material and different thickness. Instead only the expose time can be controlled. After  calculated exposure time, the radiation emitting source is sent back in to a shielded enclosure. X Rays are produced by a electrical system. In this case the strength of radiation can be controlled in relative to the component atomic number and thickness of material. Here we are going to see how to make the radiographic set up and ex...

 ThermographyTesting – NonDestructive Testing Method that involves visualization of heat radiations from an object and the method is a non contact inspection technique, . It is also simply called as IR – Infrared Thermography, Thermal Imaging technique or Thermography. Principle of Infrared Thermography Testing. Infrared Thermography Sensors capture Infrared radiation from any object which is above absolute zero temperature (-273.15°C), and displays on screen as -heat distribution images, any defective areas emits more heat due to more heat distribution around the defects. What is Infrared Wave? Infrared are Electromagtic Radiation similar to Light Radiation, but are not visible to human eyes , becauses of their longer wavelength, the wave length of which is longer than Red (i.e  700 nm) is called Infra Red( i.e Inferior Frequency than Red Light), Amount of Infrared Radiation captured is equal to the heat dissipated from that area, therefore ...