Which best describes how the torch should be moved during GTAW root welding on pipe?

Which best describes how the torch should be moved during GTAW root welding on pipe?

• A. The angle should be constantly adjusted to follow the circumference
• B. Remain fixed at the initial angle
• C. Only adjust after every two inches
• D. Move away from circumference

Answer: (A)

When welding the root of a pipe with GTAW, think of the joint as a circular seam that you must trace all the way around. The arc needs to stay aligned with that seam as you move around, so you continuously adjust the torch angle to follow the circumference. This keeps the heat input and the arc centered on the joint, promoting a uniform root bead and proper penetration around the entire circle. If you keep the torch at a fixed angle, the arc will drift relative to the seam as you go, which can cause inconsistent fusion, gaps, porosity, or burn-through on one side. So, moving the torch with small, continuous angle changes to match the pipe’s curvature is essential for a consistent, high-quality root pass.

When welding the root of a pipe with GTAW, think of the joint as a circular seam that you must trace all the way around. The arc needs to stay aligned with that seam as you move around, so you continuously adjust the torch angle to follow the circumference. This keeps the heat input and the arc centered on the joint, promoting a uniform root bead and proper penetration around the entire circle. If you keep the torch at a fixed angle, the arc will drift relative to the seam as you go, which can cause inconsistent fusion, gaps, porosity, or burn-through on one side. So, moving the torch with small, continuous angle changes to match the pipe’s curvature is essential for a consistent, high-quality root pass.