The R suffix in E7018-R specifically designates that the electrode has passed which type of requirements?

The R suffix in E7018-R specifically designates that the electrode has passed which type of requirements?

• A. That the coating contains micro-oxides.
• B. That the electrode is approved for use in underwater welding.
• C. It designates that the electrode meets the requirements of absorbed moisture testing.
• D. It indicates the electrode has an extended shelf life.

Answer: (C)

The R suffix tells you about moisture handling. In low-hydrogen electrodes like E7018, controlling moisture content is crucial because moisture can release hydrogen into the weld and cause cracking. The R designation specifically means the electrode has passed absorbed moisture testing, confirming it meets the moisture-content requirements set by the standard. It’s not about coating micro-oxides, underwater welding approvals, or shelf life—those aspects are not what the R suffix denotes.

The R suffix tells you about moisture handling. In low-hydrogen electrodes like E7018, controlling moisture content is crucial because moisture can release hydrogen into the weld and cause cracking. The R designation specifically means the electrode has passed absorbed moisture testing, confirming it meets the moisture-content requirements set by the standard. It’s not about coating micro-oxides, underwater welding approvals, or shelf life—those aspects are not what the R suffix denotes.