This system is based on the fusion of materials through an electric arc produced at the tip of a tungsten electrode and protected by an inert gas (usually argon and helium).
The cords produced by this system are very resistant and less sensitive to corrosion, precisely because of the protection of the oxygen intrusion that the inert gas gives to the electric arc.
This technique allows to make large contributions of material.
It is ideal for large volume fillings.
