What are common types of electrodes used in GMAW?

In Gas Metal Arc Welding (GMAW), the common types of electrodes are designated with the ER (Electrode Rod) classification, which indicates that these consumable electrodes are suitable for the process. The specific electrodes listed—ER70S-3, ER70S-6, and ER80S-D2—are commonly used for welding carbon steel and low-alloy steel in various applications.

ER70S-3 is known for its versatility and is suitable for a range of welding positions and applications. ER70S-6, on the other hand, has a higher level of deoxidizers, making it preferable for welding in less than ideal conditions where cleanliness may be an issue. ER80S-D2 is used for high-strength low-alloy steels, focusing on providing good toughness. The designation system helps ensure the appropriate selection of electrodes for specific materials and welding conditions, making option A the correct answer.

Other options contain electrode types that are typically associated with different welding processes or are not classified as suitable for GMAW. For example, the electrodes mentioned in option B are primarily used in Shielded Metal Arc Welding (SMAW). Meanwhile, the classifications in option C do not refer directly to specific types of electrodes but are