When using the post-emulsification fluorescent process, which method cannot be used?

When using the post-emulsification fluorescent process, which method cannot be used?

• A. Brushing emulsifier on the part
• B. Immersion in emulsifier
• C. Spraying emulsifier on the surface
• D. Spraying penetrant after emulsifier action

Answer: (A)

In post-emulsification fluorescent penetrant testing, the emulsifier must be applied in a non-abrasive, uniform manner to emulsify and remove excess penetrant without disturbing the penetrant film. Brushing the emulsifier on the part involves mechanical scrubbing, which can physically remove penetrant from flaws or create surface scratches and brush marks. This can distort indications and lead to unreliable results. Therefore brushing is not used. The emulsifier can be applied by immersion or by spraying to achieve even coverage without scrubbing. Spraying penetrant after emulsifier action doesn’t fit the proper post-emulsification sequence and would risk reintroducing or disturbing penetrant content.

In post-emulsification fluorescent penetrant testing, the emulsifier must be applied in a non-abrasive, uniform manner to emulsify and remove excess penetrant without disturbing the penetrant film. Brushing the emulsifier on the part involves mechanical scrubbing, which can physically remove penetrant from flaws or create surface scratches and brush marks. This can distort indications and lead to unreliable results. Therefore brushing is not used. The emulsifier can be applied by immersion or by spraying to achieve even coverage without scrubbing. Spraying penetrant after emulsifier action doesn’t fit the proper post-emulsification sequence and would risk reintroducing or disturbing penetrant content.