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Non-Destructive Testing, as the name itself suggests, is the product inspection (quality control check) process. Inspection and test typically include measurements of an output and comparison to specific requirements to determine conformity. Inspection is performed for a wide variety of purposes, e.g., distinguishing between good and bad product, determining whether a process is changing, measuring process capability, rating product quality, securing product design information, rating the inspectors accuracy, and determining the precision of measuring instruments (Juran's, 2007, p 467).
NDT is popular because of its harmless and unfaltering association with the final product to check its quality. As we acknowledge, all materials are imperfect, but this is only of concern if the imperfections adversely affect intermediate processing or use of the finished product. In order to detect imperfections, some form of testing is necessary that will not have a detrimental effect on the materials/components.NDT encompasses all the test methods that, when applied to a component, do not impair its subsequent utilization (Colangelo, p 44) If the testing does not destroy or damage the material in any way it is known as Non - Destructive Testing (NDT). NDT is crucial in characterizing final products into "zero defect" and "potentially flawed" parts, this characterization is fast and easy. Hence, the quality control is easy itself. For instance, let us take an example of a steel plant which makes "railroads". ...
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