dye penetrant inspection


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dye penetrant inspection

dye penetrant inspectionclick for a larger image
A technique of nondestructive testing to detect surface defects in metal or plastic components. The component is soaked in a penetrating liquid and then washed to remove all penetrant from its surface. The surface is then covered with a developing powder. The powder pulls the penetrant from any defects on the surface of the component. The penetrant plainly shows up on the powder-covered surface, outlining any defective surface.
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Premium quality castings generally restrict the acceptability of surface defects that are revealed by dye penetrant inspection.
Figures 4 and 5 illustrate how porosity shows up under dye penetrant inspection.
Qualitatively, the methods of evaluation include visual bubble examination, visual comparison and dye penetrant inspection.