Should PPE be used when welding stainless steel?

If engineering controls cannot adequately control fumes from stainless steel welding, it may be necessary to provide welders with appropriate respirators to reduce exposure to hexavalent chromium. This might range from disposable N95/KN95 masks to powered air-purifying respirators (PAPRs), depending on the level of exposure. However, keep in mind that respirators should not be the first or only line of defense from hex chrome in welding fumes. According to the hierarchy of controls, engineering controls such as air filtration and ventilation must be implemented before relying on PPE.