A welder needs toGTAW weld a small, intricate titanium component. Titanium is highly reactive with atmospheric gases at welding temperatures. Which tungsten electrode type and associated preparation would be most suitable to minimize contamination and ensure a clean, stable arc?

Question: A welder needs toGTAW weld a small, intricate titanium component. Titanium is highly reactive with atmospheric gases at welding temperatures. Which tungsten electrode type and associated preparation would be most suitable to minimize contamination and ensure a clean, stable arc?

Answer options:

• Pure tungsten with a balled tip.
• 2% Thoriated tungsten with a sharp, pointed tip. ✅ 2% Lanthanated tungsten with a sharp, finely ground point.
• Zirconiated tungsten with a blunted tip.

Correct answer: 2% Lanthanated tungsten with a sharp, finely ground point.

Explanation: For welding reactive metals like titanium, 2% Lanthanated tungsten (blue band) is an excellent choice due to its non-radioactive nature and superior arc starting, stability, and lower burn-off rate, even at low amperages. A sharp, finely ground point is essential for precise arc control and deep penetration, which helps reduce heat input and minimize the heat-affected zone, further protecting the reactive material. Thoriated is radioactive, and balled or blunted tips reduce arc concentration.