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| UNDERPIN |
| To provide a new support under an existing structure without removal of the super structure. |
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| ULTIMATE LIMIT STATE |
| See Limit State. |
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| ULTIMATE STRESS |
| The stress at which fracture in steel occurs. (This is not a metallurgist's definition.) |
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| ULTRASONIC WELD TESTING |
| A process using ultrasound to detect flaws within the body of a weld. |
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| UNIVERSAL SECTION |
| A range of hot rolled sections of I and H section with parallel flanges. |
