Method of casting lithium containing aluminium alloys
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United States of America Patent
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Feb 14, 2017
Grant Date -
Feb 11, 2016
app pub date -
Mar 11, 2014
filing date -
Apr 11, 2013
priority date (Note) -
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Abstract
Method of casting aluminum alloy ingot including lithium, including: preparing at least two molten aluminum based alloys in separate furnaces, first alloy with composition A free from lithium as purposive alloying element, and second alloy with composition B including lithium as purposive alloying element; transferring the first alloy via metal conveying trough from the furnace to a casting station; initiating casting an ingot and casting the first alloy to required length L1 in the casting direction; subsequently transferring the second alloy via metal conveying trough from the furnace to the casting station while simultaneously stopping transfer of the first alloy to the casting station; casting the second alloy from an end surface of the cast first alloy at length L1 to an additional required length L2 in the casting direction; cropping the cast ingot at a bottom thereof at a length greater than of equal to cast length L1.
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