Argon (Ar) is an inert gas, produced by the fractional distillation of the atmosphere. It is a gas extracted from the air that can contain traces of impurities such as oxygen, nitrogen or water vapor; however, it is suitable for aluminum welding.
The use of this gas in MAG applications allows for good arc stability and easy ignition. Furthermore, considering the low thermal conductivity, the central part of the arc column is kept at high temperatures making the drops of material that pass through the arc area more fluid.