When is a back weld applied?

When is a back weld applied?

• A. After the groove weld in the symbol has been applied.
• B. Prior to the completion of a groove weld.
• C. When there is limited access to the back side of the joint.
• D. When a partial joint penetration groove weld is required.

Answer: (A)

The back weld is deposited after the groove weld on the near side has been completed. This backing bead finishes the root from the opposite side, helping to ensure full penetration and a complete joint when a backing material isn’t used. If you had limited access to the back side, you’d be unable to apply a back weld as described, and partial joint penetration refers to the groove weld itself, not when the back weld is placed.

The back weld is deposited after the groove weld on the near side has been completed. This backing bead finishes the root from the opposite side, helping to ensure full penetration and a complete joint when a backing material isn’t used. If you had limited access to the back side, you’d be unable to apply a back weld as described, and partial joint penetration refers to the groove weld itself, not when the back weld is placed.