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| Ultimate Tensile Strength |
| The maximum load that a material withstands in a tensile test before it fractures, divided by the original cross-sectional area of the gauge length of the specimen. A more correct term to apply to this parameter of a material is Tensile Strength. |
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| Ultrasonic Inspection |
| An inspection technique in which high frequency sound waves are introduced into material in order to detect any surface or subsurface flaws that may be present. |
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| Upsetting |
| The working of a piece of metal so that its length is reduced and the cross-section of part or all of the metal is increased. |
