Degassing of Aluminum Alloys Using Ultrasonic Vibration

During the solidification of aluminum alloys, dissolved hydrogen creates porosity that, left unchecked, is detrimental to the mechanical properties of aluminum alloy castings, heavy section plates, and forgings. Degassing is the most effective, most commonly used method to reduce porosity. (Aluminum Now, July/August 2007).

The degassing method generally employed in the aluminum industry is rotary degassing, which involves bubbling argon, chlorine, and various salts through the melt to absorb hydrogen and other impurities. As these bubbles break the surface, aluminum is lost to oxidation by the furnace gases and entrapment in dross. Additionally, the use of chlorine creates environmental issues.

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aluminum alloys,hydrogen,castings,heavy section plates,forgings