Aluminum smelting temperature control

Refining temperature is too low, is not conducive to the dissolution of alloying elements and gas inclusions discharge, increasing the formation of segregation, cold shut, due to cast a tendency, but also due to lack of heat riser, so feeding the casting not reasonably have data indicate that all Aluminum Alloys smelting temperature of at least 705 degrees and should be stirred. Melting temperature not only waste energy, more serious because the higher the temperature, the more hydrogen, are more coarse grains, the more serious the oxidation of aluminum, a number of alloy elements is more severe burning and thus the mechanical properties of the alloy drop, casting and machining performance deterioration, the effects of weakening modification, reduction casting airtightness.

Production Practice has proved that the liquid alloy to a more rapid warming temperatures, a reasonable mix, in order to promote the dissolution of all alloying elements (especially refractory metals), hold in addition scum fell after pouring temperature, so that the minimum degree of segregation , hydrogen fusion also less conducive to obtain uniform and dense, high mechanical properties of the alloy, because the temperature of molten aluminum is difficult to judge with the naked eye, so no matter what type of melting furnace, should be controlled with Thermometer temperature. Thermometer should regularly check and repair. Thermowell should cycle with a metal brush clean, coated with a protective coating to ensure the accuracy of the results and to the Director temperature service life