A Red Seal Welder is performing a root pass on a 25 mm thick structural steel beam using the shielded metal arc welding (SMAW) process. The procedure calls for E7018 electrodes. Before starting, the welder notices the electrodes have been left out of the oven for four hours in a humid environment. What is the most appropriate action according to CSA W59 requirements?

Question: A Red Seal Welder is performing a root pass on a 25 mm thick structural steel beam using the shielded metal arc welding (SMAW) process. The procedure calls for E7018 electrodes. Before starting, the welder notices the electrodes have been left out of the oven for four hours in a humid environment. What is the most appropriate action according to CSA W59 requirements?

Answer options:

• Use the electrodes as is, as the root pass will be ground out anyway. ✅ Re-bake the electrodes according to the manufacturer's recommendations or the applicable W59 annex for low hydrogen electrodes.
• Discard the electrodes immediately, as they are irretrievably damaged.
• Proceed with welding, but increase the preheat temperature to compensate for potential moisture.

Correct answer: Re-bake the electrodes according to the manufacturer's recommendations or the applicable W59 annex for low hydrogen electrodes.

Explanation: CSA W59 Annex J provides specific requirements for the handling and re-baking of low hydrogen electrodes (like E7018) after exposure to atmosphere to prevent hydrogen-induced cracking. Re-baking restores their low hydrogen properties, while simply using them, discarding them outright without re-baking consideration, or increasing preheat temperature without addressing the electrode moisture is incorrect.