| Demo : Aluminium Sheet |
Description
During casting defects can develop in the ingot which prevent the ingot from being rolled to sheet successfully. Ingot cracks can develop in the ingot butt due to the stresses built up in the solidifying metal (which shrinks as it solidifies) and the close proximity of the ingot stool. The practice of grain refinement can help prevent ingot cracking by developing a finer, as cast grain size which is more resistant to cracking.
Why is it important ?
Cracked ingots must not be rolled and must be scrapped. Other defects may need to be removed by extra scalping.
How is it measured ?
Visual inspection.