What type of electrode is commonly used for welding carbon steel?

The use of E7018 electrodes is prominent in welding carbon steel due to their specific characteristics that align well with this application. E7018 electrodes are low-hydrogen, iron powder electrodes, which provide excellent arc stability, and a smooth, controllable weld bead, and they are designed to minimize the risk of hydrogen-induced cracking.

These electrodes also have a higher tensile strength, typically around 70,000 psi, which matches the strength requirement for many carbon steel structures. Their ability to strike an arc easily and produce welds that are strong and tough makes E7018 a preferred choice when welding carbon steel.

The other electrodes listed serve different purposes: E6011 is generally used for welding in more challenging conditions but is not ideal for all carbon steel applications, E308L is intended for stainless steel welding, and E4047 is used primarily for aluminum welding. Thus, E7018 stands out as the most suitable option for carbon steel welding.