Posted by Robert Hernandez on Feb 14th 2025
| Term | Definition |
|---|---|
| Ultimate tensile strength | The greatest tensile strength that a material can withstand. |
| Ultrasonic | Vibrations generated at frequencies above the range of human hearing. |
| Ultrasonic inspection | A nondestructive testing method in which ultrasonic waves are passed through the material being inspected. Echo patterns locate discontinuities. |
| Ultrasonic transducer | A device used to generate ultrasonic vibrations that, in turn, vibrate the sonotrode to perform ultrasonic welds. |
| Ultrasonic welding | A process used to weld metal or other material through the use of ultrasonic vibrations. |
| Ultraviolet rays | Energy waves that emanate from the welding arc. These waves are in the ultraviolet light spectrum. |
| Undercut | A depression at the toe of the weld which is below the surface of the base metal. |
| Undercutting | The thinning of the base metal along the toe of the weld. |
| Underfill | A depression on the face of a weld or root surface extending below the surface of the adjacent base metal. |
| Under load | In arc welding, the state of a welding machine when current is flowing through the welding circuit (while welding or with the electrode holder touching the table or workpiece). |
| Unstable arc | An arc that has not established itself in the ionized space between the electrode and the workpiece. An unstable arc may wander or stop. |
| Upset | The enlarged weld area where the parts meet in a friction weld. |
| Upslope | The rising line on a current/time program graph. |
