Which types of metal are particularly concerned with ozone production during welding?

The concern with ozone production during welding is most relevant to aluminum and stainless steel due to the chemical reactions that occur during the welding process. When these metals are welded, especially using processes that involve intense heat such as gas tungsten arc welding (GTAW), the ultraviolet (UV) radiation produced can lead to the photolytic breakdown of oxygen in the air, generating ozone.

Aluminum and stainless steel often require higher heat inputs and may also involve the use of filler materials that can enhance these reactions. It's important to recognize that ozone can be harmful to health, causing respiratory issues and other complications if proper ventilation and protective measures are not in place. In contrast, while other metals can also produce some ozone, the conditions associated with welding aluminum and stainless steel are particularly conducive to its formation, making them the metals of primary concern in this context.