What is "NDT - Dye Penetrant Examination"?

Dye Penetrant Examination is a non-destructive examination method used to detect surface breaking defects, such as cracks, laps, porosity etc., which are undetectable with the bare eye. A fluid, the penetrant, is applied to the material surface. The fluid penetrates the defects. After some time the penetrant fluid is washed off the surface. With a developer applied to the now clean surface, the defects where the fluid has penetrated are made visible. These spots are called indications. Acceptance criteria define whether or not the indication is non-acceptable (a defect) or not.

Dye Penetrant Examination is mainly used for clad layer, welds and heat affected zones.

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