Welding fumes are composed of metals and most fumes contain a small percentage of manganese. There is a concern by workers, employers, and health professionals about potential neurological effects associated with exposure to manganese in welding fumes.

Welding is one of the most hazardous occupations in construction. Traditionally, welders had to fear workplace injury from burns, electricity, and “welder’s flash” (blinding and diminished vision, see below).