Magnetic Particle Testing is an Conventional Testing Method which involves the component under testing being magnetized. This magnetization process is supplemented by the application of ferromagnetic particles to the already magnetized surface. The magnetic particles are attracted to areas of flux leakage (escaping magnetism) and form an indication at that point. This NDT method is used to test welds, castings, and forgings for surface or slightly subsurface defects. However Magnetic Particle Testing can only be used to inspect materials that can be magnetized, i.e. ferromagnetic materials.

 

Definition of Non-Destructive Testing

Nondestructive testing (NDT) has been defined as comprising those test methods used to examine an object, material or system without impairing its future usefulness. The term is generally applied to nonmedical investigations of material integrity.

What Is Non Nondestructive Testing?

Nondestructive testing asks "Is there something wrong with this material?" Various performance and proof tests, in contrast, ask "Does this component work?" This is the reason that it is not considered nondestructive testing when an inspector checks a circuit by running electric current through it. Hydrostatic pressure testing is usually proof testing and intrinsically not nondestructive testing. Acoustic emission testing used to monitor changes in a pressure vessel's integrity during hydrostatic testing is nondestructive testing.

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