Which tungsten electrode shape is most commonly used for DC GTAW?

The use of a pointed tungsten electrode shape for DC GTAW (Gas Tungsten Arc Welding) is most common because it allows for better arc stability and concentration. A pointed tip provides a small area for the arc to form, which leads to a more focused and intense arc. This is particularly beneficial in DC welding processes where a solid and uniform arc is essential for achieving high-quality and precise welds.

When the electrode is pointed, it allows welders to create a narrow heat-affected zone, which is vital for minimizing distortion and controlling the fusion into the base metals. Additionally, a pointed electrode is easier to control when welding in various positions and can contribute to smoother operation and a more stable arc, ultimately improving the overall welding performance.

The other shapes, such as flat, cylindrical, and conical, do not offer the same benefits in terms of arc stability and concentration, which is why they are less commonly used for DC GTAW applications.