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Dangerous metals used in welding include: zinc, cadmium, nickel, chromium, copper, fluoride, lead, manganese, vanadium and lead (lead paint used over metals being welded). Manganese is widely used because combining manganese with steel allows for greater forging capabilities without compromising strength, stiffness, wear resistance, hardness, and the ability to harden. Besides industrial uses, manganese is found in most foods and in healthy amounts builds enzymic structures and aids in the uptake of the vitamin B1. In excess quantities, manganese becomes a toxin that crosses the blood-brain barrier and causes injury to the basal ganglia, the portion of the brain that transmits signals to various portions of the body for motor functions. Additionally, toxic gases are released during welding including carbon monoxide, nitrogen oxide, fluorides and ozone.