Tungsten inert gas welding is a welding process belonging to the group of gas-shielded welding which is an arc welding process. In TIG welding, an electric arc burns between the workpieces and an electrode made of tungsten.
In contrast to other electric arc processes, the electrode used in TIG welding does not melt due to the high melting point of tungsten. The filler material is held in the arc in the form of wires or rods and is thus melted.
To prevent the melt from reacting with the ambient air, inert shielding gases are used because they do not react chemically with the materials involved. These are often argon or argon-nitrogen mixtures.
In combination with TIG pulse welding and TIG alternating current welding, any material suitable for fusion welding can be joined. TIG welding produces practically no welding spatter and the health risk from welding fumes is relatively low. The addition of the filler metal and the current intensity are separate parameters.
Due to the relatively low and localized heat input, welding distortion in the workpieces is lower than with other processes.
The TIG welding system consists of a power source, which in most cases can be switched between direct or alternating current welding, and a welding torch, which is connected to the power source by a hose package. The welding current conductor, the shielding gas supply and the control line are located in the hose package.