Thorium tungsten electrode is an alloy tungsten electrode containing thorium elements, usually with a red logo at the end of the electrode, so it is commonly known as “red tungsten electrode”.
Specifically, the main component of thorium tungsten electrodes is tungsten (W), doped with about 2%~4% thorium oxide (ThO₂). The addition of thorium oxide significantly improves the performance of tungsten electrodes, greatly improving their arc initiation and arc stability in argon arc welding.
Features of thorium tungsten electrodes include:
Excellent arcing performance
The element thorium can reduce the working function of the electrode surface, making it easier for the electrode to generate electron emission, faster arcing, and smoother welding start-up process.
Stable arc characteristics
Thorium tungsten electrode exhibits good arc stability in DC welding (especially DC negative DCEN), with small arc fluctuation, heat concentration, and high weld quality during welding.
Long service life
Compared with pure tungsten electrodes, thorium tungsten electrodes have stronger ablation resistance and thermal faTIGue resistance, and have a longer lifespan.
Wide range of applications
It is widely used in DC argon arc welding of carbon steel, stainless steel and other metals, especially in industrial manufacturing and maintenance.
It should be noted that thorium is a radioactive element, although the content is low and the radiation dose is small, but it is still necessary to pay attention to safety protection when using and processing thorium tungsten electrodes to avoid dust inhalation and environmental pollution.
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