Tungsten Electrodes Development Status

Tungsten has increasingly been applied in aerospace, chemical and nuclear and other fields, it is suitable for welding almost all of metal, especially active metals of refractory metals, nonferrous metals and alloys, titanium and its alloys, stainless steel and high temperature alloys.

Pure tungsten electrodes under high temperature will recrystallize to form equiaxial and coarse grain structure, what will result in the decrease of its mechanical properties. What is more, because the current capacity of pure tungsten is small, the work function (4.52eV) is high, so that the burning would be more serious under large currents. Therefore, the scientists discovered thorium tungsten electrodes material in 1913. Thorium tungsten electrode is the first used electrode in rare earth tungsten electrodes, its good performance and higher market share, what makes it one of the main hot electron emission materials currently, however, thorium element have a radioactive, its half-life grew 1.39 * 10¹⁰, In the production and use processes and its waste will have a great harm to the environment.

In view of this, in the 1970s, the former Soviet Union has started to develop a new type of electrode material, while China factories are almost successful trial-manufacture the cerium tungsten electrodes and make it popularization and application at this time. Thanks to cerium tungsten electrodes themselves own advantages, such as, no radiation pollution, good low-arc arcing performance, so it has become the preferred alternative between the small-diameter welding and low-current welding. However, there are still some limitations in the use of cerium tungsten electrodes, and therefore it can not fully replace the thorium tungsten electrodes.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
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