Root gap in groove welds is defined as what?

Root gap in groove welds is defined as what?

• A. The distance between backing bars or edge of base metal at the root.
• B. The width of the root pass.
• C. The distance from the weld bead to the heat source.
• D. The length of the root bead.

Answer: (A)

Root gap is the distance at the root opening of a groove weld—the space between the backing bar or the edge of the base metal at the root. This opening sets how wide the root weld bead must fill and ensures there is enough room for proper fusion and penetration. It’s not the width of the root pass, the distance from the weld bead to the heat source, or the length of the root bead, which describe other aspects of the weld geometry.

Root gap is the distance at the root opening of a groove weld—the space between the backing bar or the edge of the base metal at the root. This opening sets how wide the root weld bead must fill and ensures there is enough room for proper fusion and penetration. It’s not the width of the root pass, the distance from the weld bead to the heat source, or the length of the root bead, which describe other aspects of the weld geometry.