Among the skill sets possessed by surgreen, is that of non destructive testing, also termed 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. Particularly, magnetic particle inspection.

This technique 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 technique is also straightforward nevertheless does require a certain degree of study to allow the technicians to more fully understand the implications of whatever indications they may discover.

Magnets have a pair of poles, north and south. As the reader may well know, the poles behave in a predictable manner. They will both attract ferromagnetic components to themselves, however, a south pole directed at a south pole will repel each other. This behaviour could be 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 necessary to know that the two opposite poles exist 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 small electromagnet in which the coils are contained within the hand piece and the magnetic flux generated 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 material and in the surrounding air.

The lines of magnetic force emanate through the material 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 discussion, 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 material 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, applied as a suspension in a liquid.

Prior to testing, the area of test will usually 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 testing medium.

Surgreen thanks you for taking a few minutes to read this brief article.

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As I became involved in this social peer to peer sharing network, I needed a username. Several cryptic and often quite inappropriate names adorned my presence in those days online.

Listening to this community during a steadily increasing level of participation in the almost daily webinars, surgreen became the online presence he is today.

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