How high should the filler metal be above the work surface?

• A. 10° to 15°
• B. 20° to 25°
• C. 30° to 35°
• D. 5° to 10°

Answer: (B)

In TIG welding, how you hold and feed the filler metal greatly affects control of the weld pool and the quality of the bead. Keeping the filler rod about 20° to 25° above the work surface gives a smooth, controlled deposition: gravity helps the molten filler enter the pool, and the rod stays just ahead of the arc so it bonds properly to the leading edge without being drawn into the arc or splashing. This angle also supports stable arc behavior and consistent bead shape, reducing the risk of contamination from oxide and ensuring better wetting of the weld bead.

If the rod is held with a much smaller angle, the filler may not feed reliably and the deposition can be inconsistent, leading to a weaker or uneven bead. If the angle is too steep, the filler can outrun the pool or spatter more, making it harder to place accurately and burning material into the weld rather than into the weld pool.