Something about Thoriated Tungsten Electrode Radioactivity Ⅰ

Thoriated tungsten electrode contains thorium, which is a radioactive material that can pose health and environmental risks at elevated exposure levels. Thorium is a low-level radioactive material that primarily emits alpha particles, some beta and gamma radiation as well. The electrode is normally sharpened by grinding as part of the standard procedure while preparing to perform GTAW (Gas Tungsten Arc Welding). Dust particles from this grinding process can cause internal radiation exposure if the dust is accidentally ingested or inhaled, so caution is necessary. Concern regarding radiation exposure to the external body from the electrode is minimal. Thoriated tungsten electrode has a wide application because they make good welds and are long lasting and quite easy to use. A thoriated tungsten electrode operates at a temperature well below its melting temperature compared to a pure tungsten electrode. This result in a much lower rate of consumption of the electrode during welding, which eliminates much of the “arc wander” associated with balled pure tungsten. Other reasons for their use include easier arc initiation, reduced weld metal contamination, higher current carrying capacity, the ability to sharpen the electrode, and a longer life. 



 

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