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.
| Standard | Alloy | Type | Chemical Composition(%) | Solidus | Liquidus | Application |
| Thoriated Tungsten | WT10 | Thoriated Tungsten | Tungsten:Balance Thorium-Oxide:0.9-1.1% | I Q:0.9-1.2 | I O:＜0.20 | Colors Sign:Yellow |
| Thoriated Tungsten | WT20 | Thoriated Tungsten | Tungsten:Balance Thorium-Oxide:1.8-2.2% | I Q:1.8-2.2 | I O:＜0.20 | Colors Sign:Red |
| Thoriated Tungsten | WT30 | Thoriated Tungsten | Tungsten:Balance Thorium-Oxide:2.8-3.2% | I Q:2.8-3.2 | I O:＜0.20 | Colors Sign:Purple |
| Thoriated Tungsten | WT40 | Thoriated Tungsten | Tungsten:Balance Thorium-Oxide:3.8-4.2% | I Q:3.8-4.2 | I O:＜0.20 | Colors Sign:Orange |
| Cerium Tungsten | WC20 | Cerium Tungsten | Tungsten:Balance; Thorium-Oxide:3.8-4.2% | I Q:1.8-2.2 | I O:＜0.20 | Colors Sign:Grey |
| Lanthanated Tungsten | WL10 | Lanthanated Tungsten | Tungsten:Balance; Thorium-Oxide:0.9-1.1% | I O:＜0.20 | Colors Sign:Black | |
| Lanthanated Tungsten | WL15 | Lanthanated Tungsten | Tungsten:Balance Thorium-Oxide:1.3-1.7% | I O:＜0.20 | Colors Sign:Golden Yellow | |
| Lanthanated Tungsten | WL20 | Lanthanated Tungsten | Tungsten:Balance; Thorium-Oxide:1.8-2.2% | I Q:1.8-3.2 | I O:＜0.20 | Colors Sign:Sky blue |
| Pure Tungsten | WP | Pure Tungsten | Tungsten:Balance; Impuritie:<0.5% | - | I O:＜0.10 | Colors Sign:Green |
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