Technical Data

Metallurgical Terms

U.

Chemical symbol for uranium.

Ultimate Tensile Stress.

(See Tensile Strength).

Ultrasonic Inspection.

A method of non-destructive testing which detects internal discontinuities in metals. Owing to the piezo-electric effect certain crystals can be made to vibrate when influenced by an oscillating electric current. For ultrasonic inspection the crystal is made to vibrate at frequencies between ½ and 10 megacycles per second and when held against a piece of steel causes the vibrations to travel through the steel and be reflected back from the opposite side or from any intervening defects. The echoes are made visible on a cathode ray tube.

Upending.

(See Upsetting).

Upsetting.

Working a piece of stock in such a way that its length is shortened and its cross-sectional area is increased. It has the effect of increasing ductility in the radial and tangential directions.