Which statement correctly describes the R suffix in E7018-R?

Which statement correctly describes the R suffix in E7018-R?

• A. It means the electrode is rated for higher tensile strength than E7018.
• B. It means the electrode has lower moisture concerns.
• C. It means the electrode costs less to manufacture.
• D. It designates that the electrode meets the requirements of absorbed moisture testing.

Answer: (D)

The R suffix on an E7018 electrode flags a moisture-related performance test requirement. In welding electrode classifications, adding suffixes communicates special properties or tests beyond the basic class. Here, R means the electrode has been evaluated for absorbed moisture and meets the specified limits. This is important because moisture in the coating can raise hydrogen levels in the weld metal, increasing the risk of hydrogen-induced cracking in high-strength applications. So the R designation directly relates to moisture testing, not to tensile strength, manufacturing cost, or a general moisture tendency.

The R suffix on an E7018 electrode flags a moisture-related performance test requirement. In welding electrode classifications, adding suffixes communicates special properties or tests beyond the basic class. Here, R means the electrode has been evaluated for absorbed moisture and meets the specified limits. This is important because moisture in the coating can raise hydrogen levels in the weld metal, increasing the risk of hydrogen-induced cracking in high-strength applications. So the R designation directly relates to moisture testing, not to tensile strength, manufacturing cost, or a general moisture tendency.