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Non-destructive testing (NDT) is a technology widely used in the inspection of the integrity of equipment and pipes in operation. It is used by the industry to evaluate the properties of a material, component, structure, or system for characteristic differences or welding defects and discontinuities without causing damage to the original part. Early detection of defects in metal structure is very important, allowing timely replacement and repair. Therefore, factories can operate safely, save repair costs, and avoid possible disasters [1]. Non-destructive testing consists of different methods, usually divided into two main groups according to their ability to detect defects:

Design and assembly of an apparatus system based on the Villari effect for detecting stress concentration zone on ferromagnetic materials