There are several different types of electrodes that can be used in SMAW, or Shielded Metal Arc Welding. The most common type of electrode is the mild steel electrode, which is well-suited for general purpose welding. Other common types of electrodes include stainless steel electrodes, which are used for welding stainless steel; cast iron electrodes, which are used for welding cast iron; and hardfacing electrodes, which are used to weld on hardfacing metals.