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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Chilling may or may not improve the soundness of a casting when measured by standard non-destructive testing techniques like radiography or dye penetrant inspection, but the influence on microstructure and mechanical properties can be significant.
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.