T.O. 33B-1-1Glossary 97VISIBLE DYE PENETRANT (PT): An intensely colored (usually red) highly penetrating liquid which will providemaximum contrast with the white developer when used for detection of surface discontinuities under normal light.VISIBILITY (MT): The ability of magnetic particles to be seen against a contrasting background.VOID: Discontinuities in which there is a physical separation between opposite walls.VOLTAGE: The unit of electromotive force that tends to cause an electric current to flow through a conductor.VOLTAGE REGULATOR: A device that automatically compensates for variations in line-power voltage, thusmaintaining nearly constant voltage on the electrical circuit.WWATER-BREAK (MT): A method of testing the water suspension for the proper amount of wetting agent. Theinability of the rinse water to cover the entire surface in an unbroken film.WATER-COOLED TUBE (RT): An X-ray tube for which the principal method of cooling is dissipation of heat,directly or indirectly, by means of water.WATER DELAY COLUMN (UT): A hollow column filled with water and attached to a search unit; causes a timedelay between the initial pulse and front surface signal.WATER PATH (UT): In immersion inspection or inspection using a water column delay, the distance from the searchunit face to the test part front surface.WATER TOLERANCE (IT): The amount of water that a penetrant or emulsifier can absorb before its effectiveness isimpaired.WATER TRAVEL (UT): In immersion testing the distance from the face of the search unit to the entry surface of thematerial under test.WATER WASHABLE (PT): A water-washable penetrant is an oil-like material containing an emulsifying agent thatmakes it washable by water rinsing.WATER-WASHABILITY (PT): The property of a penetrant that permits it to be cleaned from the surface of a part bywashing with water.WAVE FRONT (UT): In a wave disturbance, a continuous surface drawn through the most forward points which havethe same phase.WAVE INTERFERENCE (UT): The production of a series of maxima and minima of sound pressure, as a consequenceof the superimposition of waves having different phases.WAVELENGTH: The distance between two points having the same phase in two consecutive cycles of a periodic wave,along a line in the direction of propagation.WAVELENGTH (UT): The distance between two corresponding points of the periodic pattern of particle motion that isa characteristic of ultrasonic energy propagation.WAVE TRAIN (UT): Succession of ultrasonic waves arising from the same source, having the same characteristics,and propagating along the same path.
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