Tungsten Inert Gas welding(TIG) or Gas Tungsten Arc welding(GTA W) uses a nonconsumable tungsten electrode which must be shielded with an inert gas,The arc is initiated between the tip of the electrode and work to melt the metal being welded,as well as the filler metal,when used. A gas shield protects the electrode and the molten weld pool,and provides the required arc characteristics.
| Alloy | Standard | Added Impurity | Impurity% | Other | Electric Discharged Power | Colors Sign |
| WT10 | Thoriated Tungsten | ThO2 | 0.9-1.2 | <0.20 | 2.0-3.9 | Yellow |
| WT20 | Thoriated Tungsten | ThO2 | 1.8-2.2 | <0.20 | 2.0-3.9 | Red |
| WT30 | Thoriated Tungsten | ThO2 | 2.8-3.2 | <0.20 | 2.0-3.9 | Purple |
| WT40 | Thoriated Tungsten | ThO2 | 3.8-4.2 | <0.20 | 2.0-3.9 | Orange |
| WC20 | Cerium Tungsten | CeO2 | 1.8-2.2 | <0.20 | 2.7-2.8 | Grey |
| WL10 | Lanthanated Tungsten | La2O3 | 0.8-1.2 | <0.20 | 2.8-3.2 | Black |
| WL15 | Lanthanated Tungsten | La2O3 | 1.3-1.7 | <0.20 | 2.8-3.0 | Golden Yellow |
| WL20 | Lanthanated Tungsten | La2O3 | 1.8-2.2 | <0.20 | 2.6-2.7 | Sky Blue |
| WP | Pure Tungsten | <0.20 | 4.5 | Green |
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