For the 5G root pass, which statement about travel direction is correct?

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Multiple Choice

For the 5G root pass, which statement about travel direction is correct?

When you’re doing a 5G root pass, how you move the torch along the joint directly affects heat control, pool shape, and how slag and molten metal behave as you progress. Downhill travel helps gravity pull excess molten metal toward the trailing edge and keeps the slag behind the advancing bead. This tends to give a more stable, well-fused root with fewer defects, and it reduces the risk of burn-through or lack of fusion at the root, especially on thinner-walled pipe. Uphill travel tends to push the pool into the joint, making it harder to control the bead and to achieve a clean root fusion. Vertical travel isn’t typical for a 5G root pass, and saying travel direction is irrelevant overlooks the practical impact of pool control and slag management.

When you’re doing a 5G root pass, how you move the torch along the joint directly affects heat control, pool shape, and how slag and molten metal behave as you progress. Downhill travel helps gravity pull excess molten metal toward the trailing edge and keeps the slag behind the advancing bead. This tends to give a more stable, well-fused root with fewer defects, and it reduces the risk of burn-through or lack of fusion at the root, especially on thinner-walled pipe. Uphill travel tends to push the pool into the joint, making it harder to control the bead and to achieve a clean root fusion. Vertical travel isn’t typical for a 5G root pass, and saying travel direction is irrelevant overlooks the practical impact of pool control and slag management.

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