What factor influences the choice of filler material in GTAW?

The choice of filler material in Gas Tungsten Arc Welding (GTAW) is primarily influenced by its compatibility with the base metal being welded. This ensures that the filler material integrates well with the base metal to create a strong, cohesive joint. When the filler material has a similar composition to the base metal, it helps maintain the mechanical properties of the weld, such as strength, ductility, and corrosion resistance.

Selecting a filler that is compatible with the base metal also aids in reducing issues such as weld cracking or poor bonding, enhancing overall weld quality. Compatibility also includes considerations around thermal expansion and contraction, which if not accounted for could lead to defects in the weld.

While factors like cost, color, and availability might play a role in the decision-making process, they do not have the same critical impact on the performance and integrity of the weld as compatibility does. Hence, emphasizing the correct filler material that aligns with the base metal is essential for achieving optimal welding results in GTAW.