In GTAW, what is the effect of using too much travel speed?

Using too much travel speed in Gas Tungsten Arc Welding (GTAW) can lead to undercutting of the weld. This occurs because increased travel speed reduces the amount of time the welding arc is in contact with the base metal, resulting in insufficient heat being applied to melt the materials effectively. Consequently, the weld bead may not adequately penetrate into the base material, leaving grooves or undercuts along the edges of the joint.

This lack of fusion and penetration diminishes the overall strength and integrity of the weld. In contrast, proper travel speed is crucial for achieving the desired depth of penetration and uniform bead appearance, ensuring a strong, well-fused weld. The relationship between travel speed and heat input is critical in maintaining good weld quality, as both can significantly influence the characteristics of the final weld.