Terminolgy Of Tig Welding
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Tig Welding Terminolgy, The process of TIG welding (Tungsten Inert Gas, also receives the following title: GTAW Gas Tungsten Arc Welding) is characterized by the use of a non-consumable tungsten electrode together with an inert noble gas such as helium or argon. Initially, the protective arc welding was used only in gas welding of stainless steels and other difficult to weld metals. Currently, several variants of the procedure apply to the union of all types of metals. For reasons of quality, speed and ease operative.
The procedure may be manual or automatic. This procedure uses as an energy source that protects the electric arc melting bath. The welding arc jumps from a tungsten electrode is not consumed during the welding operation. A stream of inert gas, supplied with a certain pressure through a nozzle surrounding the electrode, expelling the air from the vicinity of the welding zone, preventing the oxidation of the electrode, the weld pool and heat-affected zone . The single electrode is used to establish the arc. For joints requiring filler material is used a metal rod, which is introduced into the melt.
When working with direct current, the welding circuit can be fed with direct polarity fig.1: the electrons flow from the electrode to the workpiece, which is generated in a large amount of heat, or reverse polarity fig.2: the circulation of electrons occurs from the workpiece to the electrode, causing a strong warming of the latter.
