which material are inspected in non destructrive testing wha

which material are inspected in non destructrive testing

what is eddy current testing

mazimum size that can be inpected in ndt

Solution

non destructrive testing (NDT) is the process of inspecting, testing, or evaluating materials, components or assemblies for discontinuities, or differences in characteristics without destroying the serviceability of the part or system. NDT is commonly used in forensic engineering, mechanical engineering, petroleum engineering, electrical engineering, civil engineering, systems engineering, aeronautical engineering, medicine etc.

eddy current testing is one of many electromagnetic testing methods used in nondestructive testing (NDT).

Eddy current testing is based on the phenomenon of electromagnetic induction. In an eddy current probe, an alternating current flows through a wire coil and generates an oscillating magnetic field. If the probe and its magnetic field are brought close to a metal test piece, eddy current will begin to move through the metal. That eddy current flowing through the metal will in turn generate its own magnetic field, which will interact with the coil and its field through mutual inductance. Changes in thickness or defects like near-surface cracking will alter the amplitude and pattern of the eddy current and the resulting magnetic field. This helps in detecting surface flaws in conducive materials.