Investigate Different Surfaces With Magnetic Particle Examination



There is frequently a need to inspect metal surface and structure both in used and new parts. The technology applied is magnetic particle examination which makes use of the ferromagnetic properties of almost all manufactured parts. This means that components that are not manufactured from iron, nickel or cobalt alloys are not able to use this method. Thus aluminum, copper and brass products use other methods such as X-ray during inspection. Coincidentally, regular manufactured parts, which require being structurally strong in their application, can use the technology. Materials including steel for construction and also cast iron for engine blocks must be subjected to quality examination at their place of production.

Magnetic particle examination works by use of a magnetic particle tester. A magnetic compound is also used such as powder or liquid suspension. The magnetic particle testers maintain the inspection piece in place. Contact on the surface area with the head and also tail of the tester permits an electric current to be passed through for magnetization. The magnetic flux created will generally leak through any discontinuities of the part. In this process, the magnetic particle tester aids reveal cracks and fractures through gathering of magnetic materials at those points. It additionally helps reveal the unevenness of a surface that is supposed to be smooth. In the body of the part, it may reveal unwanted bubbles that affect structural sturdiness.

As opposed to other structural test methods such as impact assessment, magnetic particle examination does not deteriorate the tested part. The magnetic particle tester is therefore a non destructive tester. This permits stringent quality control to be conducted on every part in a manufacturing line. A non destructive tester is additionally useful on site applications as the inspector is not permitted to damage the part. For exterior purposes, portable or handheld magnetic particle testers are used. This is because of their effectiveness and convenience of use. The usage of magnetic suspension as opposed to magnetic powder gives a more even application and is considerably less wasteful.

Magnetic particle examination machines utilize alternating current, direct current and also half wave direct current. Based on the part type and the requirements for inspection, different types of current are suitable. Alternating current is suitable for surface inspection whereas direct current improves on sub-surface examination. Direct current may be rectified from alternating current. For much more exacting examination half wave direct current must be used. It enables a more pin point indication of the magnetic particles as this type of current helps to move the particles. In such an instance, a qualified magnetic particle inspection machine is utilized.

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