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Alloy aluminum smelting technical requirements
Dec 27, 2017

How to control the temperature in the process of aluminum alloy smelting
Aluminum alloy and other aluminum alloy profiles in the melting process must have a high enough temperature to ensure that the metal elements such as aluminum plate full melting and dissolution. Heating temperature is too high, melting faster, but also make the metal and furnace gas, lining and other harmful effects of shortening the time. Production practice shows that rapid heating to speed up the melting of the charge, shorten the melting time, to improve productivity and quality are beneficial.
However, on the other hand, overheating is apt to happen when the temperature is too high. In particular, when using a flame reheating furnace, the projectile directly touches the charge and heats it to the molten or semi-molten metal easily causing the gas to invade the melt. At the same time, the higher the temperature, the faster the metal reacts with the furnace gas, the lining, and the like, thereby causing a loss of the metal and a decrease of the melt quality. Overheating not only easy to absorb a large amount of gas, but also easy to make the ingot after solidification coarse grain structure, increasing the tendency of ingot cracking, affecting the performance of the alloy. Therefore, the melting operation, the melting temperature should be controlled to prevent overheating melt.
However, too low melting temperature in the production practice is meaningless. Therefore, in actual production, it is necessary to prevent the melt overheating, but also accelerate the melting, shortening the melting time. Melting temperature control is extremely important. Most factories are using rapid melting high-temperature rapid melting, the semi-solid, semi-liquid state of the metal is exposed to a strong short period of time under the furnace gas and flame, reducing metal oxidation, burning and reducing the absorption of the melt gas. When the charge level appears after a layer of liquid metal, in order to reduce local melt overheating, should be appropriately reduced melting temperature, and strengthen the mixing process in the melting process to facilitate the melt heat conduction. In particular, to control the melting of the charge R is about to melt the melting temperature. Metal or alloy due to latent heat of melting, when the charge is completely melted, the temperature will rise, if the melting temperature control is too high, it will cause the entire molten metal within the pool overheating. In production practice, most of the melt overheating that occurs is caused by poor temperature control in this situation.
The actual choice of melting temperature, in theory, should be based on a variety of different alloy aluminum alloy elements such as the melting point to determine the temperature. Different alloys have different melting points, that is, different compositions of alloys, the solid began to be melted temperature (known as the solidus temperature) and the total melting temperature (referred to as the liquidus temperature) is also different. In these two temperature ranges, the metal is semi-liquid semi-solid.

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