Pure tungsten electrode -Ⅰ

The content of tungsten in pure tungsten electrode is higher than 99.5%, and there are no other alloying elements existing. Compared to other tungsten alloy electrode, such as, tungsten copper electrode, silver tungsten electrode and tungsten nickel electrode, etc., because pure tungsten has high electronic work function, so its arc is more difficult than tungsten alloy electrode, and it is also difficult to maintain the stability of the arc beam. It’s the tip temperature of the electrode is relatively high, it will make the grain easy to grow, and the arc beam will be instable, leading to harder arcing, and shorter service life (improvement method: adding rare earth oxides). Therefore, tungsten is only used for AC welding.

Arc, as the name suggests, it is the process that the welding material (welding wires, welding rods, etc.) ignite the arc process.

Basic index of pure tungsten electrode

Electronic work function refers to the electronic break the bound of the nucleus, the minimum energy needed to escape from the surface of the material.



 

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