Theory  
  Magnetic Particle Inspection is one of the most widely used methods of Non Destructive Testing. The technique is used for detection of surface and near-surface flaws in ferromagnetic materials. The process involves magnetizing a part during which time ferromagnetic particles - either suspended in a fluid or in a powder form - are applied. A surface flaw will highly distort the magnetic lines of force and this is known as flux leakage.
Fine magnetic particles distributed to the part will be attracted to the areas of the flux leakage, creating a visible indication of the flaw. In most cases, the magnetic particles are coated  with a fluorescent material enabling them to be viewed under UV lamp in darkened condition. Magnetic Particle Inspection is commonly used to inspect casting, weldments, forgings, and machined or stamped parts.
 
   
     
 
 
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