A structural steel fabricator is building heavy pressure vessels. The specified welding procedure calls for fill and cap passes using E7018 electrodes, and the operator is achieving good quality. For optimal mechanical properties and prevention of hydrogen-induced cracking, which storage practice is critical for these electrodes?

Question: A structural steel fabricator is building heavy pressure vessels. The specified welding procedure calls for fill and cap passes using E7018 electrodes, and the operator is achieving good quality. For optimal mechanical properties and prevention of hydrogen-induced cracking, which storage practice is critical for these electrodes?

Answer options:

• Storing in a tightly sealed container at ambient shop temperature. ✅ Storing in a heated electrode oven at 120 °C (250 °F) or higher.
• Storing on an open shelf in a dry area.
• Storing in a freezer to prevent moisture absorption.

Correct answer: Storing in a heated electrode oven at 120 °C (250 °F) or higher.

Explanation: Low hydrogen E7018 electrodes are highly susceptible to moisture absorption, which can lead to hydrogen-induced cracking. Storing them in a heated electrode oven at the manufacturer's recommended temperature (typically 120 °C or higher) keeps them dry and prevents hydrogen pickup.