OHST Practice Exam

During electric arc welding, ozone is a significant hazardous gas that is produced, primarily due to the high-voltage environment created during the welding process. When the electric arc forms, it generates sufficient energy to break apart oxygen molecules in the air, allowing them to recombine into ozone (O3).

Ozone is a respiratory irritant and can cause various health issues such as throat irritation, coughing, and shortness of breath, especially in high concentrations or prolonged exposure. The development of ozone during welding not only poses a risk to the welder’s health but also necessitates proper ventilation and protective measures in the workplace to mitigate exposure.

The other options presented, while associated with various industrial processes or chemical reactions, are not typically linked to electric arc welding. For instance, hydrogen peroxide is not a product of welding gases, diacetyl is primarily related to flavoring products, and diethylamine is more relevant in chemical synthesis contexts than in welding operations. Therefore, the recognition of ozone as a byproduct highlights its significance in addressing workplace safety and health standards in welding environments.