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An arc welding process that produces coalescence of metals by heating them with an arc between a tungsten (nonconsumable) electrode and the work. Shielding is obtained from a gas or gas mixture. (This process is sometimes called TIG (Tungsten Inert Gas) welding, a nonpreferred term). GTAW may be performed by adding filler material to the weld, or by a fusion process in which no filler is added.
Publication Source: American Society of Mechanical Engineers (ASME), Bioprocessing Equipment (BPE) - 2009 Revision
See also: Orbital Welding
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