Understanding Quality in Aluminum Castings
Make sure you know the quality of the castings you receive from your metal casting supplier.
Geoffrey Sigworth, Foseco, Cleveland, Ohio
magine you obtain a cast compo- nent from a metalcasting facility with good results. After some time, your purchase agent puts the part out for bid, and another supplier comes in with a lower price.
I MARCH/APRIL 2011
The order is awarded to the new plant, but the mechanical properties are found to be signifi cantly lower when the castings are delivered. The new metalcaster is using the same alloy and tooling. What has caused the change?
Dissolved gas, iron and oxide inclu-
sions in aluminum all have a deleteri- ous effect on casting quality. Iron limits are specifi ed for commercial alloys, but how do we measure gas and ox- ides? One approach to this problem
METAL CASTING DESIGN AND PURCHASING 37
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