In arc welding, what is the main function of the electrode?

• A. to provide shielding gas
• B. to generate enough heat to produce the weld
• C. to transfer heat away from the weld
• D. to add filler material

Answer: (B)

The electrode’s primary job in arc welding is to carry the welding current and create an electric arc that generates the heat needed to melt the base metal and the electrode itself. This heat forms a molten weld pool that, when it cools, solidifies into the weld joint. In consumable electrodes, the melted electrode also becomes the filler material, and the flux on the electrode helps shield the molten metal and slag off impurities. While shielding gas is important in some arc welding processes, the essential function of establishing the heat to produce the weld is the main role of the electrode.