2 FUSED FLUXES are manufactured by mixing the ingredients together and then melting them in an electric furnace to form a homogeneous liquid. The liquid flux is then cooled until solid and ground to a particular size suitable for the intended use of the flux. The major advantages of fused fluxes include: n Because of the high processing temperature (> 3000°F/1614°C), all components in the flux become chemically combined. As a result, fused fluxes provide stable welding performance even at high current levels. n Fused fluxes will generally not pick up moisture; surface moisture condensing on the flux particlesduring storage can be driven off by baking at a low temperature (300°F/40°C for 1 hr.). n Since fused fluxes are pre-melted, they are extremely homogeneous and therefore, maintain consistent chemistry throughout the weld deposit. n Fused flux slag may be crushed and re-used; however, this may result in a loss of operability or mechanical properties. n Fused fluxes provide for the highest travel speeds in welding. The major disadvantage for using fused fluxes is: n They contain no metallic deoxidizers, therefore minimizing their tolerance to rust and mill scale. Continued on next page...
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