After cutting a solid aluminium Cast bar , sometimes we see elliptical Void at the centre of it , what can be various reasons of this Void formation .
Please see following publication:
http://www.ijrat.org/downloads/march-2014/paper%20id-232014109.pdf
The only way a pore can form in aluminum is growth on an inclusion, such as bifilms. Based on physics, particularly cavitation pressure calculations, homogenepus or heterogeneous nucleation is impossible. We have a paper in review on this very topic.
In order to help you more information could be interesting :
Is it always at the same height?
Is it perfectly elliptical ?
Is it for all the alloys? If there's only one could you precise it?
Do you control the gaseous content of your alloy before pouring?
How do you control pulling speed?
have you checked your cooling system?
Could it be linked to a production issue? (beginning of the week, change of any kind with the steady production)
Is it for all the dimensions you cast or just one specific product?
Hope those question might help you solve your issue
Feel free to send more informations
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