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Why is liquid aluminum degassed?

Why is liquid aluminum degassed?

Why is liquid aluminum degassed?

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Why is liquid aluminum degassed?

  Because aluminum is less dense than most metals, it has a softer texture. Appear light. If there is air at the time of pouring, it will be easier to mix in liquid aluminum than other metals, and the pouring will form porosity defects. Affect its use, so that castings scrap.

In view of the unsatisfactory gas and slag removal effect of refining in the furnace, and the alloy liquid absorbed gas in the process of transferring from the melting furnace to the casting, resulting in slag inclusion, resulting in secondary pollution, reducing the purity and poor fluidity of the alloy liquid, many casting defects will occur after casting, affecting the mechanical and processing performance of the product, etc. Therefore, it must be degassed before casting to eliminate these gases and slag to improve the internal quality of the alloy liquid.

If hydrogen is not removed, the result is:

 

01.Hydrogen is present in the atmosphere and is highly soluble in molten aluminum. The inclusion of hydrogen in the liquid aluminum will create white spots or pores, which will not achieve acceptable mechanical or physical properties for the final product, and the tensile strength will be reduced.

 

02.During ingot processing, pores may blister on forged products, extruded products, sheet and thick plates. The surface properties of the material are not good, such as peeling during casting and foaming during heat treatment of the material, which also indicates the existence of hydrogen.

 

03.Metallic and non-metallic inclusions may also damage the mechanical properties of the product. After machining and polishing, inclusions will also increase tool wear.

                                             Material from the Internet, if there is infringement, please contact delete.

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