NDT means Non
Destructive Testing. Normally we may use two different types of testing methods
such as destructive testing as well as non destructive testing for a test
material. Destructive testing means we must destroy that particular test
material and detect whether some defect is there or not. In this case we cannot use that material afterwards.
So we are going for NDT. Here we are not doing any harm to the test material so
that we may reuse it. NDT mainly follows two different standards.
·
American Standards (ASNT)
·
British Standards.
In NDT we are mainly
dealing four different types of testing methods.
Ø Ultrasonic
Testing (UT)
Ø Liquid
Penetrant Testing (LPT)
Ø Magnetic
Particle Testing (MPT)
Ø Radiographic
Testing (RT)
Ultrasonic Testing (UT)
We are mainly using the
Ultrasonic sounds waves for the testing. This method is commonly used for
finding out the internal discontinuities present inside a test material. The sound
waves will passes through the test materials and produce an echo.
Liquid Penetrant
Testing (LPT)
LPT is the technique
used for finding out surface discontinuity by applying a Penetrant on the
surface of the test specimen.
Magnetic Particle Testing
(MPT)
MPT also used for
finding out surface discontinuity by utilizing the test specimens magnetizing
property.
Radiographic Testing (RT)
RT is used for finding
out internal discontinuity such as porous, cracks, voids. etc. This is done by
making use of electromagnetic waves. And an image will be produced on the
radiographic film. By analyzing the film we are able to find out the defect.
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