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GEMS Techonologies Ltd. Registered in England & Wales No. 10190837            

# 825 / 2007



The Science of Nondestructive Testing is a survey course that is designed to explain the process and breakdown the science behind five of the most common nondestructive tests used in the welding industry.

NDT stands for non-destructive testing. In other words it is a way of testing without destroying. This means that the component- the casting, weld or forging, can continue to be used and that the nondestructive testing method has done no harm. In today s world where new materials are being developed, older materials and bonding methods are being subjected to higher pressures and loads, NDT ensures that materials can continue to operate to their highest capacity with the assurance that they will not fail within predetermined time limits. NDT can be used to ensure the quality right from raw material stage through fabrication and processing to pre-service and in-service inspection. Apart from ensuring the structural integrity, quality and reliability of components and plants, today NDT finds extensive applications for condition monitoring, residual life assessment, energy audit, etc.

There are many NDT techniques and methods used, depending on four main criteria:

·         Material Type     ·         Defect Type   ·         Defect Size   ·         Defect Location

Common NDT Methods

  • Volumetric Examination Method
  • Ultrasonic Testing –UT

Ultrasonic inspection uses high frequency sound waves to detect imperfections or changes in properties within the materials. It can also be used to measure the thickness of a wide range of metallic and non-metallic materials where access from one side only is available. 

  • Radiography Testing -RT 

Radiography uses an x-ray device or radioactive isotope as a source of radiation which passes through the material and is captured on film or digital device. After processing the film an image of varying density is obtained. Possible imperfections are identified through density changes.

  • Surface Examination Method
  • Liquid Penetrant -PT 

In Liquid Penetrant the test object or material is coated with a visible or fluorescent dye solution. The excess dye is removed from the surface and a developer which acts like a blotter is applied drawing penetrant out of imperfections open to the surface. With visible dyes, the vivid colour contrast between the penetrant and the developer is used. With fluorescent dyes an ultraviolet lamp is used to make the bleed out fluoresce brightly allowing the imperfection to be seen readily.

  • Magnetic Particle -MT 

Magnetic Particle inspection is used to identify surface and near surface discontinuities in ferromagnetic materials such as steel and iron. The technique uses the principle that magnetic lines of force (flux) will be distorted by the presence of a discontinuity. Discontinuities (for example, cracks) are located from the flux distortion following the application of fine magnetic particles to the area under test.

  • Practical for All Test Radiography Testing – RT  > Ultrasonic Testing –UT
  • Liquid Penetrant -PT  > Magnetic Particle –MT

Course Durations

for Registration ASNT- NDT Level 1 and Level 2

Fast Track – 10 Days

Regular Track – 28 Days

for admissions and information please contact

If you have any difficulty in finding us, please call +91-9346356290

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