Duncans Metal Pages
Casting problems
Last updated: 13 Nov 2018


I'm putting this together as a "rogues gallery" of castings that did not turn out quite right.  As I learn, things will get better (I hope), so there will be less things to add to this page...

Dissolved gas: Molten aluminium can react with moisture in the air to dissolve hydrogen gas in the melt.  The gas comes out of solution when the molten metal cools down - you need to click on the picture to see the pin holes in enough detail - they go all the way through the material.

The cure for this is to use a proprietary de-gassing tablet shortly before pouring to bubble chlorine through the melt and remove the dissolved gas.

These pages are maintained by Duncan Munro.  All content on this site is Copyright ©2002-2022 Duncan Amplification.
Warning: These pages consist of images and descriptions of equipment which can reach high temperatures creating hazardous and potentially dangerous situations.  These pages should not be taken as a step by step guide on how to construct any items or carry out any particular procedure, nor should any references to safety contained herein be taken to guarantee safety in all situations.