What feature is vital for achieving good arc stability in GTAW?

Achieving good arc stability in Gas Tungsten Arc Welding (GTAW) heavily relies on the type of electrode used and its cleaning. The electrode in GTAW is typically made of tungsten, which comes in different compositions and purities. The type of electrode affects its melting point, current-carrying capability, and overall performance during welding.

Furthermore, maintaining a clean electrode is crucial because surface contaminants, such as oil, grease, and oxidation, can disrupt the flow of current and create instability in the arc. A well-prepared, clean electrode provides consistent electrical conductivity, which is essential for producing a steady arc. When the surface of the electrode is free from contaminants, it helps form and maintain a stable arc, improving weld quality.

While aspects such as electrode diameter, length, and type of power supply also play roles in the overall GTAW process, they are less directly tied to arc stability compared to the condition and type of the electrode itself. For instance, variations in diameter can change the heat input but don't significantly influence stability like a clean, correctly chosen electrode can. The power supply type affects the arc characteristics, but the stability relates more specifically to the interaction between the electrode and the workpiece, as influenced by cleanliness and material composition.