Which method of adding filler metal in GTAW pipe welding is easier when the filler rod is bent to the shape of the pipe?

• A. Dipping or preplacement of the rod
• B. Cup walking
• C. Consumable inserts
• D. Filler pass

Answer: (A)

Dipping or preplacement of the rod is the easiest method when the filler rod is bent to the shape of the pipe. When the rod is bent to follow the pipe’s curvature, you can bring the end of the rod directly into the joint and dip it into the molten pool or place a short length right at the start of the weld. This lets you deposit filler with minimal rod twisting or repositioning, keeping a consistent stick-out and arc angle as you move around the pipe. The bent rod naturally seats against the inner contour, so you don’t have to chase the filler with complex hand movements, which helps you maintain a steady pool and uniform penetration on curved joints.

Cup walking, while useful in other contexts for controlling the pool, adds extra maneuvering when the rod is already contoured to the pipe and you’re trying to feed filler smoothly around a bend. Consumable inserts are separate filler sources placed into the joint rather than fed from a bent filler rod, and a filler pass is simply adding filler in a separate step rather than leveraging the rod’s shape to ease deposition.