What dangerous fumes/gases can GTAW produce?

In the context of Gas Tungsten Arc Welding (GTAW), it is crucial to understand the types of dangerous fumes and gases that the process can generate. Among the options provided, ozone, thorium dust, and phosgene gas are recognized as notable hazards associated with GTAW.

Ozone is produced when ultraviolet light generated during the welding arc interacts with oxygen in the air. It can cause respiratory issues and irritation to the eyes and throat.

Thorium dust is a concern primarily in the use of thoriated tungsten electrodes. The inhalation of thorium dust can lead to significant health risks, as thorium is a radioactive element.

Phosgene gas, although not produced directly through the welding process, can be generated if materials like certain plastics are burned or overheated. Its presence poses serious respiratory risks and can lead to severe health complications.

Identifying these hazards is critical for ensuring proper safety protocols and protective measures while engaging in GTAW operations. The other options, while they may contain harmful substances, are not typically produced or associated with the conventional GTAW process.