SWAGING: Forming a taper or a reduction on metal products such as rod and tubing by forging, squeezing or
SWEEP (UT): The uniform and repeated movement of an electron beam across the CRT.
SWEEP DELAY (UT): See DELAYED SWEEP. A delay in time, after the initial pulse, of starting the sweep
presentation; also used to denote the control used for adjusting the time of starting the sweep presentation.
SWEEP LENGTH (UT): Length of time or distance represented by the horizontal base line on an A-scan.
SYSTEM CONCEPT (PT): A combination of penetrant and emulsifier supplied by one manufacturer and intended to
perform a specific type or process of inspection. The term Family Concept has been changed to System Concept to
comply with DOD standardization requirements.
TARGET (RT): The area on the anode of an X-ray tube on which the electron stream impinges and from which the
primary beam of X-rays is emitted.
TARNISH: Surface discoloration of a metal caused by formation of a thin film of corrosion product.
TCG: See DISTANCE AMPLITUDE CORRECTION.
TEAR, HOT: Same as CRACK, HOT; but developing before the casting has completely solidified.
TEAR, MACHINING: See CRACKS, MACHINING.
TECHNIQUE CHART (RT): See EXPOSURE CHART.
In heat treatment, reheating hardened steel or hardened cast iron to some temperature below the eutectoid
temperature for the purpose of decreasing the hardness and increasing the toughness. The process also is sometimes
applied to normalized steel.
In tool steels, temper is sometimes used, but inadvisedly, to denote the carbon content.
In nonferrous alloys and in some ferrous alloys (steels that cannot be hardened by heat treatment), the
hardness and strength produced by mechanical or thermal treatment, or both, and characterized by a certain structure,
mechanical properties, or reduction in area during cold working.
TEMPER BRITTLENESS: Brittleness that results when certain steels are held within, or are cooled slowly through, a
certain range of temperature below the transformation range. The brittleness is revealed by notched- bar impact tests at
or below room temperature.
TEMPERATURE ENVELOPE (PT): The temperature range over which a particular penetrant inspection test will
TEMPERING: Reheating a quench-hardened or normalized ferrous alloy to a temperature below the transformation
range and then cooling at any rate desired.
TEMPLATE: A guide, gage or pattern for checking dimensions or locations.