When is a back weld applied in the welding symbol sequence?

When is a back weld applied in the welding symbol sequence?

• 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)

Back welds are shown as a follow‑up step after the main groove weld is deposited. In welding symbol practice, the groove weld (root) is placed first to establish the joint and achieve the required penetration. The back weld is then applied on the opposite face as a separate operation to close the root and reinforce the joint. This ordering mirrors how the actual welding is often carried out: form the root with the groove weld, then complete or back weld from the backside to ensure full joint integrity. If a back weld is specified but access to the back side is limited, that constraint would be reflected elsewhere in the documentation, but when a back weld is required, it is performed after the groove weld.

Back welds are shown as a follow‑up step after the main groove weld is deposited. In welding symbol practice, the groove weld (root) is placed first to establish the joint and achieve the required penetration. The back weld is then applied on the opposite face as a separate operation to close the root and reinforce the joint. This ordering mirrors how the actual welding is often carried out: form the root with the groove weld, then complete or back weld from the backside to ensure full joint integrity. If a back weld is specified but access to the back side is limited, that constraint would be reflected elsewhere in the documentation, but when a back weld is required, it is performed after the groove weld.