Which is the most common current type and polarity used for GTAW?

In Gas Tungsten Arc Welding (GTAW), the most commonly used current type and polarity is Direct Current Electrode Negative (DCEN). This polarity is favored because it provides several advantages that are crucial in the welding process.

Using DCEN ensures that a significant amount of heat is concentrated at the workpiece rather than the electrode. This heat concentration allows for deeper penetration into the base material, which is particularly valuable when welding thicker metals or when strong welds are required. The tungsten electrode remains cooler in comparison because it is not absorbing as much heat energy, which not only prolongs the life of the electrode but also improves the stability of the arc.

DCEN is also conducive to achieving a clean weld, as it helps in removing oxides and contaminants from the surface of the workpiece due to the heat produced. This characteristic is essential in applications where high-quality joints are critical, such as in aerospace, piping, and other industries that require precise control over weld integrity.

In contrast, while AC (Alternating Current) is commonly used for welding materials such as aluminum because it can provide cleaning action to remove oxide layers, and Pulsed DC may enhance control in thin or reactive materials, DCEN stands out as the standard choice for a wide variety