Dye Penetration Test Non-Destructive

 

Dye Penetration Test Non-Destructive







Dye Penetration Test Non-Destructive Inspection methods. Also, known as the Liquid penetration test, the Dye penetrant test is widely used to detect surface discontinuities like cracks, fractures, porosity, grinding defects, incomplete fusion, and flaws in joints. This test or inspection method is serving as an aid in finding irregularities in aluminum, cast iron, brass, steel and stainless steel, copper, magnesium, carbides, stellite, ceramics, and even certain plastic materials. So, the dye penetration test is suitable for both ferrous and non-ferrous materials and is highly economical as compared to the other non-destructive inspection methods.




The Dye Penetration test works on the  principal of of capillary action. A liquid with low surface tension can penetrate into a clean and dry surface if the liquid is kept for a certain time called “Dwell Time”.


Liquid Penetrant has to be applied over the test specimen/object by dipping, spraying or brushing. The excess amount has to be removed after the dwell time is over. A developer is applied sometimes. The main function of the developer is to draw the penetrant out of the flaw making an invisible indication, visible to the inspector. Depending on the type of dye used, the dye penetration inspection is performed under white or ultraviolet light 

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