Main Page | See live article | Alphabetical index Tungsten inert gas welding or TIG is also known as gas tungsten arc welding (GTAW) or HELIARC, a trade name of Linde. A tungsten electrode protected by a shielding gas is used to create an arc, a filler rod is then melted by the arc to join the metals. Unlike most other types of arc welding, the tungsten electrode is not used up by TIG welding. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.