Glossary and Terms of the Foundry Industry

SFSA: Glossary of Terms - U

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Ultrasonic Cleaning: Immersion cleaning aided by ultrasonic waves which cause microagitation.
Ultrasonic Testing: A nondestructive method of testing metal for flaws based on the fact that ultrasonic waves are reflected and refracted at the boundaries of a solid medium.
Undercooling: See Supercooling
Unkilled Steel: A wild steel insufficiently deoxidized so that it evolves gas and blowholes during solidification.
Upgrading: In castings, the removal and repair of discontinuities to raise the quality level of the casting beyond that which can be economically achieved by good foundry practice.
Upper Yield Point (also Yield Point): Denoted in yield point phenomenon as a distinct break from the elastic region accompanied by a drop in load, yet prior to plastic deformation in the stress-strain curve in a low-carbon steel.
Urea Formaldehyde Resin: A thermosetting product of condensation from urea or thio-urea and formaldehyde, soluble in water and used as a sand binder in core and mold compounds.

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