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| Term | Definition |
|---|---|
| X ray | A stream of high energy photons; common term for a photographic image made through the use of Xrays. |
| X ray inspection | The use of X rays to check a weld for flaws or defects. |
| Yield strength | The stress in psi at which a weld test specimen assumes a specific limiting permanent set. |
| ZZ Top | A small south Texas band that makes music particularly good for listening to while welding. |
| Zirconia | Zirconium dioxide, a compound used in some TIG (GTAW) tungsten electrodes for AC welding.It permits easier arc starting than pure tungsten. |