Surgreen Offers A Quick Outline Of Magnetic Particle Inspection - A Surface Method Of Examination

Among the skill sets possessed by surgreen, is the trade of non destructive testing, also called non destructive examination within the American reference codes. The particular area of expertise specialised in by surgreen, is that of surface methods of inspection. Especially, magnetic particle inspection.

This system of inspection involves the application of magnetic flux to a ferromagnetic component and the simultaneous distribution of a similarly ferromagnetic inspection medium. Although that brief description of the technique may appear complicated, it is in actuality very simple.

The science behind the process is also straightforward however does require a certain degree of study to allow the technicians to further understand the implications of all the indications they may discover.

Magnets possess a pair of poles, north and south. As the reader may well know, the poles behave in a predictable fashion. They will both attract ferromagnetic components to themselves, however, a south pole directed at a south pole will repulse each other. This behaviour is often summed up with the statement that like poles repel but opposite poles attract.

This behaviour is of basically no especial relevance to this discussion, though it is important to understand that the two opposite poles are present to be able to understand this simple explanation of magnetic particle inspection.

A frequently used tool in magnetic particle inspection is the handheld yoke. It is a compact electromagnet where the coils are contained within the hand piece and the magnetic flux created is guided through two segmented and also flexible prods. These prods are placed on the surface undergoing testing and electrical power applied. Lines of magnetic force or magnetic flux will be created in the ferro-magnetic component and in the surrounding air.

The lines of magnetic force will emanate through the component in concentric circles and as a result of a further condition arising, eddy currents will be created between the two poles. For the requirements of this article, it will suffice to say that a line of magnetic force will flow linearly between the north and south poles of the yoke.

Should any surface breaking discontinuity in the component being examined be present, magnetic flux will leak emanating from this discontinuity and attract the ferromagnetic particles applied by the tech. These particles are generally, though not always, administered as a suspension in a fluid.

Prior to testing, the area of test will often have been painted white and the particles are going to be of a contrasting black colour. Any existing discontinuity arising in this painted region will present a visible indication upon the synchronised application of magnetising force and examination medium.

Surgreen thanks you for finding the time to read this short article.

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