Which type of electrode is generally used in the GTAW process?

In the Gas Tungsten Arc Welding (GTAW) process, the type of electrode that is predominantly used is non-consumable. This means that the electrode, typically made of tungsten, does not melt during the welding process. Instead, it serves as a stable source of arc energy while the filler material, if required, is fed separately into the weld pool.

The non-consumable electrode is essential for maintaining the quality and control over the welding process, allowing for the precision needed, especially in applications where strong and clean welds are required, such as in stainless steel and aluminum. The high melting point of tungsten allows it to withstand the intense heat of the arc without degrading or being consumed, which is a key advantage in maintaining a stable and consistent weld arc.

Furthermore, the use of a non-consumable electrode allows for a clearer distinction between the electrode and the filler material, ensuring that impurities do not contaminate the weld. This characteristic is particularly important in industries that demand high standards of weld integrity and appearance, such as aerospace and nuclear applications.