Which polarity is specified for E6010 welding?

Which polarity is specified for E6010 welding?

• A. DC reverse polarity only
• B. DC straight polarity only
• C. AC polarity only
• D. AC or DC reverse polarity

Answer: (A)

Polarity controls how heat and arc characteristics behave with a given electrode, and E6010 is designed for deep-penetration root passes. The cellulose-coated E6010 flux reacts best when the electrode is positive, meaning direct current reverse polarity (electrode positive, workpiece negative). This setup concentrates more heat into the base metal, producing the deep, penetrating arc that helps forge a solid root pass and good fusion even in dirty or painted steel. The coating also supports a stable arc and slag behavior under this polarity, which is why this electrode is specified for DC reverse polarity. In practice, this electrode isn’t chosen for straight polarity, and the arc quality with AC isn’t the target performance for this weld profile, so DC reverse polarity is the recommended and most reliable option.

Polarity controls how heat and arc characteristics behave with a given electrode, and E6010 is designed for deep-penetration root passes. The cellulose-coated E6010 flux reacts best when the electrode is positive, meaning direct current reverse polarity (electrode positive, workpiece negative). This setup concentrates more heat into the base metal, producing the deep, penetrating arc that helps forge a solid root pass and good fusion even in dirty or painted steel. The coating also supports a stable arc and slag behavior under this polarity, which is why this electrode is specified for DC reverse polarity. In practice, this electrode isn’t chosen for straight polarity, and the arc quality with AC isn’t the target performance for this weld profile, so DC reverse polarity is the recommended and most reliable option.