The types of electrodes used in MIG welding applications are known as, "consumable" electrodes. Unlike non-consumable electrodes, consumable electrodes melt as an electric current is drawn through them, creating a liquid fill metal that drips onto a work piece and hardens as it cools.
The consumer has access to a number of different types of consumable welding electrodes for various MIG welding applications. Most electrodes feature a flux coating. Bare electrodes, however, do not feature a flux coating. Rutile electrodes, whose coats have lots of titanium oxide (rutile), provide a quiet and smooth electric arc while welding. Iron oxide electrodes provide stable electric arcs and are ideal for flat welding.
Electrodes should be stored in moisture-proof containers because they need to be kept completely dry. Excessive moisture can destroy the electrode's coating. Using a wet electrode can compromise the integrity of welds. Consumers confronted with a wet electrode should not employ them until they have been thoroughly and properly dried.