What does the electrode designation E6010 indicate for SMAW carbon steel electrodes?

• A. An SMAW electrode (60 ksi minimum tensile strength) with a cellulose-based coating suitable for deep penetration; typically used for root passes and vertical-up welding
• B. A GMAW wire for thin metals
• C. A TIG rod
• D. A filler for FCAW

Answer: (A)

In SMAW electrode designations, the E shows it’s an electrode used for welding metal. The 60 indicates the weld metal has a minimum tensile strength of 60 ksi, so it’s intended for carbon steels in that strength range. The last two digits reflect the coating type and its welding characteristics; for this code, a cellulose-based coating provides deep penetration, which is why this electrode is favored for root passes and vertical-up welding. It’s specifically an SMAW carbon-steel electrode, not a GMAW (MIG) wire, not a TIG (GTAW) rod, and not a FCAW filler. This combination—60 ksi strength, cellulose coating, and deep penetration—explains why it’s used for root passes and vertical-up welding on carbon steel.