What factor can lead to inconsistent heat distribution in GTAW?

Inconsistent travel speed is a critical factor that can lead to uneven heat distribution in Gas Tungsten Arc Welding (GTAW). When the travel speed fluctuates, it alters the time that the welding arc is concentrated on a specific area of the material being welded. If the welder moves too slowly, excessive heat can build up in one area, leading to burning through the material or creating warpage. Conversely, if the travel speed is too fast, there may not be enough heat applied to adequately melt the filler material and base metals, resulting in poor fusion and weak joints.

Maintaining a consistent travel speed allows for uniform heat application, which is vital for achieving a smooth, controlled weld that penetrates adequately while minimizing defects. This results in a stable arc and consistent bead appearance, ultimately leading to stronger and more reliable welds.