U
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.
Undercut
An irregular groove at a toe of a run in the parent metal, or
in previously deposited weld metal, due to welding.
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.
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.
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