Which statement best describes the significance of the R suffix in E7018-R?

Which statement best describes the significance of the R suffix in E7018-R?

• A. It signals the electrode is manufactured in Russia.
• B. It indicates the electrode requires radiographic testing.
• C. It indicates the electrode is for high-temperature service.
• D. It designates that the electrode meets the requirements of absorbed moisture testing.

Answer: (D)

Moisture control is a critical factor for low-hydrogen electrodes. The suffix on an electrode designation signals special handling or testing related to how much moisture the electrode can have without affecting weld quality. The R in E7018-R indicates that the electrode has been tested to meet absorbed moisture requirements. This matters because moisture in the electrode can release hydrogen when welded, increasing the risk of hydrogen-induced cracking and porosity. By meeting absorbed moisture testing, the electrode is qualified to perform without introducing excessive hydrogen. This suffix is not about where the electrode was made, nor about undergoing nondestructive radiographic testing, and it isn’t a marker for high-temperature service.

Moisture control is a critical factor for low-hydrogen electrodes. The suffix on an electrode designation signals special handling or testing related to how much moisture the electrode can have without affecting weld quality. The R in E7018-R indicates that the electrode has been tested to meet absorbed moisture requirements. This matters because moisture in the electrode can release hydrogen when welded, increasing the risk of hydrogen-induced cracking and porosity. By meeting absorbed moisture testing, the electrode is qualified to perform without introducing excessive hydrogen.

This suffix is not about where the electrode was made, nor about undergoing nondestructive radiographic testing, and it isn’t a marker for high-temperature service.