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U
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Chemical symbol for Uranium. |
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Ultimate Analysis
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In chemistry, this is a quantitative analysis in which percentages
of all elements in the substance are determined. |
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Ultimate Tensile Strength
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The highest load applied in breaking a tensile test piece divided by
the original cross- sectional area of the test piece. |
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Ultrasonic Inspection
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A means of locating defects in steel. When acoustic energy in the
ultrasonic range is passed through steel, the sound waves tend to
travel in straight lines, rather than diffusing in all directions as
they do in the audible range. If there is a defect in the path of
the beam it will cause a reflection of some of the energy, depleting
the energy transmitted. This casts an acoustic shadow which can be
monitored by a detector placed opposite the transducer or energy
source. If the acoustic energy is introduced as a very short burst,
then the reflected energy coming back to the originating transducer
can also be used to show the size and depth of the defect.
Ultrasonic techniques can be used to detect deeply located defects
or those contained in the surface layer. Skill and experience are
required in interpreting the results portrayed on the cathode ray
tube. |
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Unkilled Steel
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Steel which has been insufficiently deoxidized and evolves gas
during solidification with the formation of blow-holes. |
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Upsetting
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Working a piece of steel so that its length is shortened and its
cross-sectional area is increased. Its effect is to increase
ductility in the radial and tangential directions. |
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Uranium
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A white malleable metal which is softer than steel. Its specific
gravity is 18.7, it melts at a temperature of 2400șC. |
