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Among the skill sets possessed by surgreen, is the trade of non destructive testing, referred to as 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 process of inspection involves the application of magnetic flux to a ferromagnetic material and the simultaneous delivery 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 but nevertheless does require a certain degree of study to allow the technicians to further understand the implications of any indications they may observe.

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

This trait is of basically no especial relevance to this discussion, though it is important to know that the two opposite poles are present in order to understand this brief explanation of magnetic particle inspection.

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

The lines of magnetic force emanate through the component in concentric rings and due to 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 run linearly between the north and south poles of the yoke.

Should any surface breaking discontinuity in the component being tested be present, magnetic flux will leak 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 liquid.

Prior to testing, the area of test will often have been painted white and the particles will be of a contrasting black colour. Any kind of 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 spending some time to read this short article.

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