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Understanding Welding Electrodes Welding electrodes come in various types, each suited to specific welding tasks. The most common are consumable electrodes used in arc welding processes like MIG and stick welding. Consumable electrodes melt and become part of the weld. Non-consumable electrodes, such as those used in TIG welding, do not melt but instead provide a conduit for the electric arc. A knowledgeable supplier must be able to advise on the best type of electrode for your welding needs, providing insight that stems from a blend of theoretical knowledge and practical experience.