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Surgreen Gives A Brief Definition Of Magnetic Particle Inspection - A Surface Method Of Inspection
One of the skill sets possessed by surgreen, is that 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. Principally, magnetic particle inspection.
This system of inspection involves the application of magnetic flux to a ferromagnetic component and the simultaneous delivery 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 technique is also straightforward however does require a certain level of study to allow the technicians to further understand the implications of all the indications they may observe.
Magnets have got two poles, north and south. As the readers may well know, these poles behave in a predictable manner. 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 and conversely opposite poles attract.
This trait is of no especial importance to this discussion, although it is necessary to understand that the two opposite poles are present to be able 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 small electromagnet where the coils are contained within the hand piece and the magnetic flux produced is guided 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 material 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 developing, eddy currents will be generated between the 2 poles. For the purposes of this discussion, 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 administered by the technician. Such particles are usually, though not always, applied 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 kind of discontinuity occurring in this painted area will present an evident indication upon the simultaneous application of magnetising force and testing medium.
Surgreen thanks you for finding the time to read this short article.
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