What is a dye penetrant test?

With the penetrant test in accordance with DIN EN 571-1, fine surface cracks and porosities in weld seams can be made visible.

After cleaning the surface to be inspected, a contrast agent (red or fluorescent) is sprayed on.

Through the capillary effect, this agent penetrates any surface defects there might be.

After re-cleaning the surface, a developer (white) is then sprayed on, which extracts the contrast agent (from any hairline cracks, etc.) and through color contrast, enables an easy evaluation of the defects.

After passing a liquid penetration test, the thermowell is marked with “PT”.

Author: carl