PT Vocabulary and terms Flashcards
Capillarity or Capillary action
The tendency of liquids to penetrate or migrate into small openings such as cracks, pits, or fissures.
Color-Contrast Dye
A dye which can be used in a penetrant to impart sufficient color intensity to give good color contrast in indications against the background of the surface being tested, when viewed under WHITE LIGHT.
Crack Contaminate
Material which fills a crack and which may prevent penetrants from entering
Dark Adaptation
The adjustment of the pupils of the eyes and internal eye changes, when one passes from bright to a darkened space. This adjustment permits maximum seeing in the dim area.
Defect
A discontinuity the size, shape, orientation, or location of which makes it detrimental to the useful service of the party in which it occurs
Developer
A finely divided material (powder) applied over the surface of a part to help bring out penetrant indications
Developing Time
the time between the application of the developer and the examination of the part for indications
Discontinuity
An opening in a part representing an actual break in continuity, permitting penetrant to enter when it breaks the surface. The term is usually applied to material flaws rather than to intended openings resulting from design, or assembly of separate parts
Emulsifier
A material which, applied over the film of the penetrant on the surface of a part, mixes with the penetrant and enables it to be washed off the surface with water
Emulsification Time
The time allowed for the emulsifier to act on the penetrant before the part is washed, after emulsifier is applied as a separate step
Evaluation:
The process of deciding as to the severity of the condition after the indication has been interpreted. Evaluation leads to the decision as to whether the part must be rejected, salvaged or may be accepted for use
Fluorescence
The property of a substance which enables it to receive light energy of one wave length, covert a portion of it to a different and longer wave length and re-emit the energy as visible light
Fluorescent Dye
A dye that becomes fluorescent, giving off light, when it is exposed to ultraviolet or near ultraviolet light
Indication
The visible evidence of penetrant that has come out of a discontinuity, indicating to the inspector that some sort of surface opening is present.
Indication, False
A penetrant indication on the surface of a part not caused by an actual discontinuity but by some other non-relevant circumstance
Interpretation
The process of judging from an indication of a discontinuity what the cause of the indication and the nature of the discontinuity actually all.
Penetrability
The property of a penetrant that causes it to find its way into very fine openings, such as cracks
Penetrant
The fluid, usually a liquid, but it can be a gas, that when applied to a test piece, will enter any flaws present due to the capillary action of the penetrant material and will produce an indication of the flaw
Penetrant, Color Contrast
A penetrant incorporating a dye usually non-fluorescent, sufficiently intense to give good visibility to flaw indications under white light
Penetrant, Post Emulsification
A type of penetrant containing no emulsifier, but which is cleaned from a surface with water after applying an emulsifier as a separate step. The term is ofter abbreviated as “P.E.” penetrant or “P.E.” Method
Penetrant, Water Washable
A type of penetrant which incorporates an emulsifier, thus making it possible to clean a surface coated with such a penetrant by means of water
Penetrating Time
The time allowed, after penetrant has been applied to a surface, for the penetrant to enter discontinuities which may be present also called “dwell time”.
