Abstract
Gas metal arc welding (GMAW) of aluminum results in the emission of ultraviolet radiation which then causes the production of ozone and nitrogen dioxide. Two novel methods were developed; one to suppress the ozone at the arc, and one to suppress it for protection of nearby personnel while providing a controlled flow of local ventilation to minimize ozone reaching the operator's breathing zone. Without these control methods, the ozone levels were in excess of the TLV® of 0.1 ppm, but with these devices, the levels were maintained well below the TLV.