New threshold limits for manganese exposure

摘要

Fusion welding and pressure welding processes both produce visible smoke and fumes that contain harmful metal fume and gas by-products that can be hazardous to a welder s health. Manganese oxide has gained so much attention as a hazardous element found in welding fumes that it has warranted a closer study of its side effects. The American Conference of Governmental Industrial Hygienists (ACGIH) has revised previous opinion of what the safe level of manganese ingestion is considered to be and has made new recommendations to the levels that welders should be exposed to.