What is Non-Destructive Testing (NDT)?
By definition, Non Destructive Testing is the testing of materials for surface or internal flaws or metallurgical condition, without interfering with the integrity of the material or suitability for service. The technique can be applied on a sampling basis for individual investigation or may be used for complete checking of material in a production quality system.
What is the difference between Non Destructive Testing and Destructive Testing?
Destructive Testing destroys or changes the material in some way such that even if it passes the test, it is no longer fit for services. Examples might be tensile and compression testing. Non Destructive Testing (NDT) does not destroy or change the material so that it remains still fit for service if it passes the test.