Top Quality Investigation By Magnetic Particle Examination
There is usually a need to inspect metal surface and structure both in used and new parts. The technology used is magnetic particle examination which utilizes the ferromagnetic properties of most manufactured parts. This means that components that are not made out of iron, nickel or cobalt alloys cannot use this method. Hence aluminum, copper and brass products use other methods such as X-ray during inspection. Coincidentally, common manufactured parts, which require being structurally strong in their application, could use the technology. Materials such as steel for construction and also cast iron for engine blocks need to be subjected to quality inspection at their place of fabrication.
Magnetic particle examination works by use of a magnetic particle tester. A magnetic substance is also used such as powder or liquid solution. The magnetic particle testers hold the inspection piece in place. Contact on the facade with the head and tail of the tester enables an electric current to be passed through for magnetization. The magnetic flux created will tend to leak through any discontinuities of the element. In this technique, the magnetic particle tester aids reveal cracks and fractures simply by gathering of magnetic particles at those points. It furthermore helps reveal the unevenness of a surface that is supposed to be flush. In the body of the part, it may reveal unneeded bubbles that affect structural strength.
As opposed to other structural test methods such as impact testing, magnetic particle examination does not affect the tested part. The magnetic particle tester is therefore a non destructive tester. This enables stringent quality control to be conducted on every part in a production line. A non destructive tester is also useful on site applications as the inspector is not in a position to damage the part. For outdoor purposes, handheld or portable magnetic particle testers are used. This is because of their effectiveness and convenience of use. The use of magnetic suspension as opposed to magnetic powder gives a much more even application and is less wasteful.
Magnetic particle examination machines utilize alternating current, direct current as well as half wave direct current. Depending on the part type and the standards for inspection, different types of current are suitable. Alternating current is sufficient for surface inspection whereas direct current strengthens on sub-surface inspection. Direct current may be rectified from alternating current. For even more exacting inspection half wave direct current needs to be used. It enables a more pin point indication of the magnetic particles because this type of current helps to move the materials. In such an instance, a specialized magnetic particle inspection machine is utilized.
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