The silent component in welding fumes is manganese. Most material safety data sheets (MSDS) won’t list it as a component of welding filler wire or rod because the amount is typically less than one percent. Since it’s not listed, this metal often gets overlooked during the air sampling of welding processes. This oversight can have serious implications. Chronic (long term) manganese exposure at levels above the 8-hour exposure limit can cause Manganism, a neurological disease similar to Parkinson’s disease.
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