Ultimate Strength
The maximum conventional stress, tensile, compressive, or shear, that a material can withstand.
Ultrasonic Frequency
A frequency, associated with elastic waves, that is greater than the highest audible frequency, generally regarded as being higher than 15 kc per sec.
Ultrasonic Waves
Waves of ultrasonic frequency. They include longitudinal, transverse, surface, and standing waves.
Universal Mill
A rolling mill in which rolls with a vertical axis roll the edges of the metal stock between some of the passes through the horizontal rolls.
Upset
(1) The localized increase in cross-sectional area resulting from the application of pressure during mechanical fabrication or welding. (2) That portion of welding cycle during which the cross-sectional area is increased by the application of pressure.
Upsetting
(1) A metal working operation similar to forging. (2) The process of axial flow under axial compression of metal, as in forming heads on rivets by flattening the end of wire.
Utility Sheet Aluminum
Mill finish coiled or flat sheet of unspecified composition and properties produced in specific standard sizes and suitable for general building trade usage.
