Procedural Principle TIG-Welding

Schematic diagram of TIG-welding
Procedural principle of TIG-welding

With TIG-welding an arc is drawn between a non-melting tungsten electrode and the workpiece. Generally as shielding gas an inert gas is used (inert = low reacting), a noble gas, which does not conjoin with any elements and this way prevents any reactions of the melted metal.

An additional wire may be fed without current, either manually (manual welding) or mechanically (automatic welding).

The main advantage of TIG-welding is the fact, that many materials can be joined. Materials up to a thickness of 0,6 mm can be welded.

Depending on materials to be welded, either DC-current or AC-current will be used. 

DC-current welding:

For welding of light alloys. At the tungsten electrode a hemispherical tungsten drop is formed. The arc burns unsteady.

AC-current welding:

For welding of alloyed steels and non-ferrous metals. The tungsten electrode is ground to a point. The arc burns steady.