To solve the casting defects caused by hereditary charge, we must use high metallurgical quality of aluminum ingots, master alloys and other charge. Specific criteria are as follows: (1) on the fracture surface should not have pinholes, pores pinhole should be less than three, the local (not more than 25% of the subject area) should not be more than three, more than three must take heavy melting Measures to reduce the pinhole. Remelting refining the same way as regular aluminum smelting, casting temperature should not exceed 660 ℃, for those of the original large grain of aluminum ingots, alloy ingots, Shandong Aluminum, should be used to lower the temperature of the ingot mold, making them rapid solidification , grain refinement. Melting temperature control melting temperature is too low, Tancheng aluminum, is not conducive to dissolve and gas alloying elements, discharge inclusions increase the formation of segregation, cold shut, due to the tendency of the cast, but also because of insufficient heat riser, the casting was within a reasonable feeding, there is data indicate that all aluminum melting temperature should reach at least 705 degrees and should be stirred. Melting temperature is too high not only a waste of energy, the more serious because the higher the temperature, aluminum, hydrogen absorbing more, also more coarse grains, the more serious of aluminum oxide, some of the burning of alloying elements are more serious, leading to alloy mechanical properties decline, casting and machining performance deterioration, the effect of weakening Modification, casting tightness is reduced. Practice has proved that the alloy was rapidly heated to a higher temperature, a reasonable stirring to dissolve all alloying elements promote (especially refractory metal element), Grilled except scum after pouring temperature drops, so that segregation The minimum melting of hydrogen is also less, aluminum prices is beneficial to obtain uniform and compact, 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 Thermometer with temperature control. Thermometer should regularly check and repair. Thermowell should cycle with a metal brush clean, coated with a protective coating, in order to ensure the accuracy of the temperature measurement results and the Registrar life. Aluminum prices, aluminum, Shengxin recycling scrap metal recycling scrap metal from the Linyi City Shengxin Limited. Linyi City Shengxin scrap metal recycling Ltd. (shengxin.tz1288.com) strong, credible, in Linyi, Shandong scrap metal industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Shengxin scrap metal recycling into the brilliant and you work for a better future!