Which gas is produced during welding that can be harmful to health?

During the welding process, ozone is produced, particularly when ultraviolet light from the welding arc interacts with oxygen in the atmosphere. Ozone is a potent respiratory irritant and can lead to a variety of health issues, including coughing, throat irritation, and damage to lung tissue with prolonged exposure. It is important for welders to have proper ventilation and respiratory protection to minimize ozone exposure in their work environment.

Oxygen, while essential for combustion and the welding process, is not harmful in itself but can become a hazard in confined spaces where it might lead to an oxygen-enriched environment and pose a risk of fire. Hydrogen, on the other hand, is a byproduct of some welding processes, but it is not inherently harmful in the same manner as ozone and is primarily a flammable gas. Argon is an inert gas used in shielding during welding and is not harmful to health; in fact, it is often used to protect the weld from contamination without reacting with the other materials.