Which electrode is associated with DC reverse polarity and deep penetration?

Which electrode is associated with DC reverse polarity and deep penetration?

• A. E6010
• B. E7018
• C. E6013
• D. E308

Answer: (A)

When you need deep penetration in carbon steel and you’re welding with direct current in reverse polarity, you want an electrode designed for a hot, penetrating arc. The cellulose-coated flux in this type of electrode creates a stable, aggressive arc that concentrates heat into the base metal when the electrode is positive (DC reverse polarity). That combination yields the deepest penetration, which is why this electrode is the go-to choice for root passes and challenging joints. Other common electrodes serve different purposes: some produce shallower welds, some are optimized for ductility and low hydrogen content, and some are meant for stainless steel. Their flux chemistry and polarity needs don’t align with the deep, root-penetration requirement as effectively as this cellulose-based electrode does.

When you need deep penetration in carbon steel and you’re welding with direct current in reverse polarity, you want an electrode designed for a hot, penetrating arc. The cellulose-coated flux in this type of electrode creates a stable, aggressive arc that concentrates heat into the base metal when the electrode is positive (DC reverse polarity). That combination yields the deepest penetration, which is why this electrode is the go-to choice for root passes and challenging joints.

Other common electrodes serve different purposes: some produce shallower welds, some are optimized for ductility and low hydrogen content, and some are meant for stainless steel. Their flux chemistry and polarity needs don’t align with the deep, root-penetration requirement as effectively as this cellulose-based electrode does.