Liquid Penetrent PT Flashcards
Aids in drawing any trapped penetrant from discontinuities and slightly spreading that penetrant on the test surfaces to improve the visibility of indications
Developer
Dye penetrant that contains fluorescent dye that emits a yellowish green light when exposed to ultraviolet or near ultraviolet light
Fluorescent penetrant
Penetrant dye visible under natural or white light
Visible penetrant
Dye penetrant containing dyes that are both colored under white light and fluorescent under ultraviolet light
Dual mode penetrant
Emulsifier that are liquid blends that combined with oil base penetrants to form a mixture that can be removed with the water spray
Lipophilic
Emulsifiers often referred to as removers are composed of emulsifying agents dissolved in water and your supply in the concentrated form
Hydrophilic
Increase the brightness intensity of fluorescent penetrant indications and the contrast of visible penetrant indications
Developers
The ability to detect discontinuities in liquid penetrant inspection
Sensitivity
Most reliable penetrant testing method is
Postemulsifiable Method (D)
This method is useful when water cannot be conveniently used or when the penetrant materials must be taken to the part
Solving removable method
This method requires less time to complete then other methods and does not require a pre-rinse or an emulsifier.
Water washable method
Water washable method designation
Method A
Post emulsifiable lipophilic designation
Method B
Solvent removable designation
Method C
Post emulsifiable hydrophilic designation
Method D
The tendency of a liquid penetrant to enter a discontinuity is primarily related to
Capillary forces
The property of a dye used in penetrant materials to emit light of a range of wavelengths different from the wavelength of light that excites the emission is called
Florescence
Penetrant system is generally considered the least sensitive
Water washable; visible die
In penetrant testing, scattered round indications on the surface of a part can be indicative of
Porosity
The total time that the penetrant is in contact with the parts surface is called the
Dwell
Require a separate emulsifier to break the penetrant down and make it water washable
Post emulsified penetrants
Which developer is commonly considered as the least sensitive
Dry developer
A liquid that interacts with an oily substance to make it water washable
Emulsifier
The term used to describe the action of a particular developer in soaking up the penetrant in a discontinuity, so as to cause the maximum bleed out the liquid penetrant for increased contrast and sensitivity is known as
Blotting
