Views:22 Author:Site Editor Publish Time: 2017-09-28 Origin:Site
The designation TIG comes from USA and is an abbreviation of Tungsten Inert Gas.
Tungsten - also called wolfram - is a metal with a fusion point of more than 3300oC, which means more than double the fusion point of the metals which are usually welded.
Inert Gas is the same thing as inactive gas, which means a type of gas that will not to combine with other elements.
In Germany this method is called WIG welding,the W meaning wolfram.TIG welding is the international standardised designation for this welding method.
The Principle of TIG Welding
TIG welding is an electric arc welding process in which the fusion energy is produced by an electric
arc burning between the workpiece and the tungsten electrode.During the welding process the electrode, the arc and the weld pool are protected against the damaging effects of the atmospheric air by an inert shielding gas.
By means of a gas nozzle the shielding gas is lead to the welding zone where it replaces the atmospheric air.
TIG welding differs from the other arc welding processes by the fact that the electrode is not consumed like the electrodes in other processes such as MIG/MAG and MMA.
TIG welding is often used for jobs that demand high quality welding such as for instance:
• The offshore industry
• Combined heat and power plants
• The petrochemical industry
• The food industry
• The chemical industry
• The nuclear industry
Materials for TIG welding
The most important area of application is:
• Welding of thin materials in stainless steels
• Nickel alloys
The increasing demands to the weld quality has made TIG welding very popular for welding of smaller tube dimensions as well as root runs in both non-alloyed and alloyed materials in heavier plates.
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