ANS:B - arc

Consumable electrodes are used in arc welding. In arc welding, a consumable electrode serves as both the source of the electrical current and the filler material for joining the workpieces. During the welding process, the electrode gradually melts and deposits filler metal into the weld joint as it is consumed. This filler metal helps to create a strong bond between the workpieces, forming the weld bead. Arc welding processes, such as shielded metal arc welding (SMAW), gas metal arc welding (GMAW), and flux-cored arc welding (FCAW), commonly utilize consumable electrodes. These electrodes come in various forms, including solid wire, flux-cored wire, and covered electrodes, depending on the specific welding process and application requirements.