In an open butt joint, the electrode wire is aimed at the center of what?

• A. Weld bead
• B. Backing
• C. Center of joint
• D. Front surface

Answer: (C)

Directing the electrode toward the center of the joint is essential in an open butt weld because it places heat and filler right where the two pieces meet. This centers the molten metal in the gap, promoting fusion of both edges and proper penetration through the joint thickness to establish a solid weld root. Aiming at the front surface or at the bead biases heat toward one side and can lead to poor root fusion or underfill. In an open butt joint, there’s typically no backing, so centering the arc helps ensure a clean, continuous root and full joint fill.