What type of welding process utilizes a non-consumable tungsten electrode?

TIG welding, or Gas Tungsten Arc Welding (GTAW), is characterized by the use of a non-consumable tungsten electrode. This process involves creating an electric arc between the tungsten electrode and the workpiece, which generates the heat necessary for melting the base metals. The tungsten electrode does not melt or become part of the weld; instead, it maintains its structure and is used to strike the arc and control the heat input.

In TIG welding, a filler material can be added separately if desired, but the primary function of the tungsten electrode is to provide a stable and precise welding arc. This allows for greater control of the weld pool, making it suitable for welding thin materials and requiring high-quality welds, such as in stainless steel or aluminum applications. The non-consumable nature of the tungsten limits the amount of contaminant introduced to the weld, enhancing the overall quality and integrity of the weld joint.

Other welding processes use electrodes that are consumed during the welding process: MIG welding and flux-cored welding both utilize filler materials that are part of the arc, while stick welding relies on a consumable electrode that melts to create the weld. This fundamental difference in electrode type is why TIG welding stands out in the context of the