Tungsten electrodes generally do not emit harmful substances in the high-temperature environment of argon arc welding. Tungsten itself is a metal with a high melting point and chemical stability, with a melting point of about 3410°C, and the tungsten electrode will not melt or decompose to produce harmful gases within the normal welding temperature range.
However, there are a few caveats:
Doped Elements In Tungsten Electrodes
Some tungsten electrodes are doped with small amounts of thorium, lanthanum, cerium, or zirconium to improve performance. Among them, thorium tungsten electrodes contain trace amounts of the radioactive substance thorium, and although the radiation dose is very low, the dust generated when grinding or breaking may pose a potential health risk. Therefore, when using thorium tungsten electrodes, attention should be paid to dust protection and proper ventilation.
High Temperature Oxidation
If the protective gas is insufficient or the atmosphere contains oxygen, the surface of the tungsten electrode may oxidize to produce tungsten oxide particles, which are irritating to the respiratory system after inhalation, and need to be protected.
Other Impurities
When the electrode is polluted or the welding environment contains harmful substances, complex gases may be generated due to high temperatures, but this has little to do with the tungsten electrode itself.
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