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CSA Certification Of Welding Inspectors (W178.2) Level 1 Practice Test

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In welding electrode designations, what does the R suffix indicate?
Correct Answer:
It designates that the electrode meets the requirements of absorbed moisture testing.
Explanation:
The suffix tells you about moisture handling of the electrode. An R on the designation means the electrode has undergone absorbed moisture testing and meets the limits for moisture content. This is important because moisture in low-hydrogen electrodes can release hydrogen when welded, leading to porosity or hydrogen cracking. So the R suffix indicates the electrode is approved for those moisture-related requirements. This is not about higher current rating, stainless steel designation, or being pre-welded—the R tag specifically flags moisture testing compliance.

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