What is one characteristic of thoriated tungsten?

Thoriated tungsten is characterized by its incorporation of thorium, which is a radioactive element. This addition enhances the electrode's performance, particularly in terms of its ability to maintain a stable arc and to resist degradation at high temperatures, making it favorable for applications in Gas Tungsten Arc Welding (GTAW). The radioactivity from thorium allows for improved electron emission, which contributes to better arc stability and a cleaner weld.

While heat resistance is an important property in welding electrodes, thoriated tungsten's standout characteristic is indeed its radioactive nature. Additionally, while the other options mention lower toxicity and low melting points, those attributes do not specifically define thoriated tungsten; in fact, there are other tungsten types that may perform better in those areas.