Final answer:
The welding process among the options that utilizes a non-consumable electrode is GTAW or TIG welding, which employs a non-consumable tungsten electrode and an inert gas for shielding.
Step-by-step explanation:
Welding is a fabrication process that joins metal materials using heat and often a filler material. There are several types of welding processes, each with its unique methods and equipment. Out of the options provided, the one that uses a non-consumable electrode is GTAW (Gas Tungsten Arc Welding), also known as TIG (Tungsten Inert Gas) welding.
In GTAW, the weld area is protected from atmospheric contamination by a shielding gas (usually an inert gas like argon), and a non-consumable tungsten electrode is used to generate the arc. The heat generated by the arc melts the metals to be joined, and a separate filler material may be added to the weld pool, if necessary. This process is known for its high-quality, precision welds, and is often used for critical work where a fine weld is required. The non-consumable tungsten electrode means it does not melt and become part of the weld, in contrast to consumable electrode processes like SMAW, GMAW, or SAW.