What is the technique referred to as 'walking the cup' in GTAW welding?

The technique referred to as 'walking the cup' in GTAW (Gas Tungsten Arc Welding) involves resting the shielding gas cup on the work surface while welding. This method is particularly effective for creating consistent welds, especially in root passes for thicker materials or when working in pipes and other round objects. By using the cup in this manner, welders can maintain a steady distance from the material being welded, which helps ensure adequate shielding of the weld pool and minimizes contamination.

This technique allows the welder to control the heat input and travel speed by shifting their position instead of moving the torch in a typical up-and-down motion or rotating it, which can lead to inconsistent welds or require more frequent adjustments to the arc length. The stability provided by resting the cup ensures the welder can develop a consistent technique and achieve better overall weld quality.