Tungsten Electrodes with Oxide Additions Are Used for TIG Welding

Details: Category: Tungsten Information; Published on Friday, 12 September 2014 16:48

Tungsten is featured by high melting point, strong electron emission ability, high modulus of elasticity, low vapour pressure, so tungsten was early used as hot electron emission material.

Properties of tungsten make tungsten be suitable for TIG welding and other electrode materials like TIG welding.

Adding rare earth oxide to tungsten to stimulate the releasing of electrons, which improves welding performance of tungsten electrodes: arcing performance is better, the stability of arc column is higher and burn out rate is smaller. Usually, rare earth additions are: cerium oxide, lanthanum oxide, zirconium oxide, yttrium oxide, thorium oxide, etc..

Pure tungsten electrodes and tungsten electrodes with oxide additions are used for TIG welding. The various types of electrodes offer specific advantage on account of their properties. A correct choice of the welding electrode is essential for attaining optimum welding conditions. The choice of the type of electrode depends on the material to be welded, the kind of welding current and the required purity of the welds.

Tungsten electrodes of different composition are characterized according to DIN32528(analogous to AWS A 5.12-69 and ASTM B 295-55T)by DIN classifications, material numbers and colour codes.

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