What is the term for a tungsten electrode that does NOT melt and become part of the weld?

A tungsten electrode that does not melt and become part of the weld is correctly referred to as a non-consumable electrode. This type of electrode is used in processes like Gas Tungsten Arc Welding (GTAW), where it maintains its integrity throughout the welding process, providing a stable arc without contributing to the weld material.

The non-consumable nature of tungsten is significant because it allows for precise control of the heat input, resulting in clean and high-quality welds. The electrode serves primarily as a source of the arc rather than becoming part of the weld joint. This characteristic is essential for achieving the desired mechanical properties and appearance of the weld.

Understanding this concept is fundamental in the field of welding, as it differentiates between types of electrodes used in various welding processes and helps in selecting the appropriate equipment for specific applications.