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Surgreen Provides A Quick Explanation Of Magnetic Particle Inspection - A Surface Method Of Examination

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

This method of inspection involves the application of magnetic flux to a ferromagnetic component and the simultaneous disbursement of a similarly ferromagnetic inspection medium. While that brief description of the technique may seem complicated, it is in practice very simple.

The science behind the process is also straightforward but nevertheless does require a certain amount of study to allow the technicians to further understand the implications of any indications they may discover.

Magnets comprise two poles, north and south. As the readers may well know, these poles behave in a predictable fashion. They will both attract ferromagnetic materials to themselves, however, a south pole aimed at a south pole will repulse each other. This behaviour can be summed up with the statement that like poles repel but opposite poles attract.

This characteristic is of no especial importance to this discussion, although it is important to know that the 2 opposite poles are present in order to understand this simple description of magnetic particle inspection.

A commonly used tool in magnetic particle inspection is the hand held yoke. This is a compact electromagnet in which the coils are incorporated within the hand piece and the magnetic flux created is directed through two segmented and also flexible prods. These prods are placed on the surface being subjected to testing and power applied. Lines of magnetic force or magnetic flux are generated in the ferro-magnetic component and in the surrounding air.

The lines of magnetic force radiate through the component in concentric rings and as a result of a further condition developing, eddy currents will be generated between the 2 poles. For the purposes 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 kind of surface breaking discontinuity in the component being tested be present, magnetic flux will leak emanating from this discontinuity and attract the ferromagnetic particles administered by the technician. Such particles are usually, though not always, administered as a suspension in a liquid.

Before testing, the area of test will often have been painted white and the particles will be of a contrasting black colour. Any existing discontinuity occurring in this painted area will present an evident indication upon the simultaneous application of magnetising force and examination medium.

Surgreen thanks you for spending some time to read through this short article.

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