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Dye Penetrant Testing

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Dye penetrant testing is a type of nondestructive testing (NDT) that reveals weld surface breaks, pits, and cracks by applying a liquid penetrant and developer. The area is first cleaned with a precleaner to remove surface contaminants that can interfere with testing. A visible dye is applied to the area and allowed to sit (or dwell) on the surface for several minutes to give the dye time to penetrate cracks and imperfections. Excess dye is then cleaned away and a developer is applied. The developer pulls remaining dye from the crack to highlight areas of concern.

Visible Dye Penetrant Testing Kits

Visible Dye Penetrant Testing Kits
Visible dye penetrant testing kits include precleaner, visible red dye, and a solvent-based developer to indicate cracks, pitting, and porosity.
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Dye Penetrant Precleaners

Dye Penetrant Precleaners
Precleaners used as part of dye penetrant weld testing remove contaminants from metal surfaces before a penetrant is applied. They remove excess penetrant before the developer is applied.
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Visible Dye Penetrants

Visible Dye Penetrants
Visible dye penetrants sink into cracks to indicate weld flaws. The penetrant is applied after the area has been cleaned. It sits on the surface for several minutes to allow the penetrant to be drawn into any cracks. After the remaining dye is wiped away, a white-colored developer is applied to draw any remaining red dye to the surface. Any colored areas that appear indicate cracks or areas of concern.
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Developers

Developers
Weld dye penetrant developers draw visible-dye penetrants from cracks and surface irregularities to indicate flaws. The developer is an opaque white color to contrast with the red penetrant to make it easier to see flaws.
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