When using solvent removable penetrants, how may the excess penetrant be removed?

Using solvent removable penetrants requires a specific technique for removing excess penetrant, which is most effectively done by wiping the part with a rag that has been dampened with solvent. This method is preferred because the solvent effectively dissolves and removes the penetrant without damaging the integrity of the material being tested.

When you wipe the surface with a damp rag, the solvent works to lift the penetrant particles from the surface, ensuring that the remaining penetrant inside any defects can still be visible during the testing process. This approach helps maintain the sensitivity of the inspection, allowing for an accurate assessment of any potential discontinuities.

Other methods, such as wiping with a dry cloth, would be less effective because they can leave more penetrant residue on the surface, possibly interfering with the results of the inspection. Rinsing under water is typically not compatible with solvent removable penetrants, as it could drive the penetrant deeper into the defects or provide an inaccurate reading. Applying heat to evaporate excess penetrant is also not a standard practice, as it could change the characteristics of the penetrant or the surface material, potentially leading to misleading results in the testing process.