Question

what \f\ group does the e7018 electrode belong to?
f1
f2
f3
f4

Explanation:

E7018 electrode is a type of welding electrode. In the classification of welding electrodes, the "F" group indicates the type of flux coating. The E7018 electrode has a low - hydrogen potassium flux coating. According to the AWS (American Welding Society) classification system for electrodes, the E7018 electrode belongs to the F4 group.

Answer:

F4