Which statement best describes filler metal usage in GTAW?

• A. The electrode feeds the filler metal automatically
• B. Filler metal is typically added separately from the electrode
• C. No filler metal is ever used
• D. The shielding gas provides filler material

Answer: (B)

In GTAW, the heat comes from a non-consumable tungsten electrode, and filler metal is added separately from the electrode. The filler rod is fed into the weld pool by the welder as needed, allowing precise control over how much metal is deposited and where. The shielding gas protects the weld area, but it does not supply filler material. There are cases where welding without filler is possible (autogenous welding) for very thin sections, but typically filler metal is supplied separately, which is why that description is the best fit.