Tungsten Electrode Materials Analysis

Tungsten electrode material having strong electron emission ability, high elastic modulus, low vapor pressure and other good properties, so often as thermal electron emitting material used in various different areas. It also as an important part used in TIG welding, plasma welding and cutting. The minimum amount of pure tungsten electrode is 99.5%. It has a higher electron work function, so it is difficult to arcing and arc beam is instability. Besides the service life is short. The shortages of pure tungsten electrodes greatly limited its application.

Tungsten electrode in order to meet the development of modern industry, from the production process and raw materials employs a lot of analysis and breakthroughs. For example, base on the shortage of pure tungsten electrode some researchers have produced a new type tungsten electrode-rare earth tungsten electrode. Rare earth tungsten electrode uses tungsten as substrate, doped with some rare earth oxides which have low electron work function, common rare earth tungsten electrodes including: thoriated tungsten electrodes, ceriated tungsten electrodes, lanthanated tungsten electrodes, zirconiated tungsten electrodes and so on. Different types rare earth tungsten electrodes having different properties can select them according to the welding material and current conditions.

With welding industry continuous development, the reliability and stability of the electrode made more stringent requirements, on this basis, invented a new tungsten electrode type-composite rare earth electrodes. The study found arcing performance and properties of the composite electrode materials are better than rare earth tungsten electrodes, and ternary composite tungsten electrode property is better than binary composite tungsten electrode.

At present, China has less research on rare earth tungsten electrode and composite rare earth tungsten electrode. Besides, the production process of them is not mature, lacking large-scale development and promotion. China has rich resources of tungsten ore and rare earth resources, we have the advantage for large-scale electrodes production, if tungsten electrode materials research and development, China's tungsten electrode industry will be able to grab opportunities in the global market, has broad market prospects.

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