This video is an introduction to the welding process known as mig. The type of material it uses depends on what type of metals you're joining, but it's always a metallic wire. The Process Of Welding Howstuffworks The metal inert gas or mig welder is one of the most common types. How does mig welding work . Mig welders perform various functions; That produces a high arc heat that melts the wire into a bead on your joint, fusing the metals together. Mig welding, aka gas metal arc welding (gmaw), involves a continuous electrode to pass through a welding gun that heats up and joins metals together. Mig welding is done using a very small electrode that is fed continuously, while the operator controls the amount of weld being done. Tungsten inert gas(tig) welding is the welding process in which heat is needed. In the mig and gmaw processes, a continuous solid wire electrode travels through the welding gun along with a shielding gas, which protects against contaminants i...