Which statement correctly describes the E7018 electrode in terms of current and polarity?

Which statement correctly describes the E7018 electrode in terms of current and polarity?

• A. AC, DCRP
• B. DC+, DCRP
• C. AC, DC-
• D. DC-, AC

Answer: (A)

E7018 is a low-hydrogen SMAW electrode that works well with either alternating current or direct current when the polarity is reversed (electrode positive). The flux coating relies on that positive polarity to maintain stable shielding and proper heat distribution, giving good bead shape, penetration, and mechanical properties. On AC the arc remains stable across each half-cycle, while on DC with the electrode positive the heat and material flow favor a strong weld with the hydrogen-controlled characteristics the electrode is designed for. Using DC with the electrode negative would reduce shielding effectiveness and can lead to defects, so the best way to describe E7018 is that it can be used with AC or DC reverse polarity.

E7018 is a low-hydrogen SMAW electrode that works well with either alternating current or direct current when the polarity is reversed (electrode positive). The flux coating relies on that positive polarity to maintain stable shielding and proper heat distribution, giving good bead shape, penetration, and mechanical properties. On AC the arc remains stable across each half-cycle, while on DC with the electrode positive the heat and material flow favor a strong weld with the hydrogen-controlled characteristics the electrode is designed for. Using DC with the electrode negative would reduce shielding effectiveness and can lead to defects, so the best way to describe E7018 is that it can be used with AC or DC reverse polarity.