Dye Penetrant Inspection Colour Contrast
This technique is limited to surface inspection of a wide range of materials i.e. ferrous or non-ferrous, machined parts and weldments. High permeability / porous materials should not be inspected using DPI due to very high bleed out.
- Preclean the surface to be inspected using a solvent cleaning agent or water.
- If water is used the surface must be dried.
- Apply a dye to the surface and allow to penetrate any potential defects. The penetrant must not be allowed to dry for the duration of the dwell time.
- Excess penetrant is then removed by a dry lint free cloth before and after removal using a moistened lint free cloth taking care not to contaminate the surface.
- A contrasting developer is applied to the surface ensuring a thin even coverage. The developer acts as blotting agent and reverse capillary action draws the penetrant from the defect causing a bleed out.
- The surface is then inspected under white light conditions of 1076 Lux or greater to detect any discontinuities or defects out with the specification desired by the client.
- Report any findings for attention or issue a report which is acceptable to specifications.
- After inspection is repeated the surface must be cleaned prior to shipping.
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