If you see E7018-R, what must you know about testing?

If you see E7018-R, what must you know about testing?

• A. It designates that the electrode meets the requirements of absorbed moisture testing.
• B. It indicates the electrode requires no testing.
• C. It shows the electrode is used for structural bolts.
• D. It implies the electrode has pre-weld heat treatment.

Answer: (A)

Moisture control is key for low-hydrogen electrodes. E7018 is a common low-hydrogen type, and the suffix on it indicates moisture testing status. Seeing E7018-R tells you that this electrode has been tested for absorbed moisture and meets the required limits. That means its hydrogen content is controlled enough to minimize hydrogen-induced issues in the weld, provided you follow storage and baking recommendations if needed. If moisture testing hadn’t been met, the electrode would typically require reconditioning or baking to bring moisture down before use. This isn’t about there being no testing, nor about bolts or pre-weld heat treatment. The -R designation specifically relates to absorbed moisture testing and hydrogen control.

Moisture control is key for low-hydrogen electrodes. E7018 is a common low-hydrogen type, and the suffix on it indicates moisture testing status. Seeing E7018-R tells you that this electrode has been tested for absorbed moisture and meets the required limits. That means its hydrogen content is controlled enough to minimize hydrogen-induced issues in the weld, provided you follow storage and baking recommendations if needed. If moisture testing hadn’t been met, the electrode would typically require reconditioning or baking to bring moisture down before use.

This isn’t about there being no testing, nor about bolts or pre-weld heat treatment. The -R designation specifically relates to absorbed moisture testing and hydrogen control.