TIG is an international abbreviation standing for tungsten inert gas (TIG) welding, which is an arc welding process that uses a non-consumable electrode in an area protected from atmospheric contamination by aninert shielding gas. The electric arch burns between the non-consumable electrode and the basic material. A wolfram electrode is fixed in the torch head.

The gas creating the protective atmosphere passes through the head. The protective atmosphere contains argon which protects the welding joint from air and which simplifies arc burning.

Welding can be carried either by melting and combining basic materials, or by adding additional material. Such welding can be done either manually; it can be partially or fully automated.

Despite the fact that this method is facing an increasing competition by MIG / MAG welding, this method still ranks among the methods achieving the highest possible quality, though it is slower and less efficient. The method can be used for nearly all weldable materials, but it is used mainly for stainless steels, aluminium and nickel.

Advantages:

  • excellent weld pool control
  • possible welding without additional materials
  • high temperature of the arc
  • no heat affect on the base material
  • high thickness welds
  • excellent protection of the weld pool
  • supply of heat can be controlled
  • possibility of welding in different positions (pipe welding)
  • possibility of welding extremely thin materials


Disadvantages:

  • high technical standards required by the apparatus
  • low efficiency