What are the casting defects in this?
We have a course on Casting and Solidification. We had to prepare an Aluminium cast for the lab work
- The pattern was created using thermocol/styrofoam
- The mould was created using plaster of paris and water. After it dried out I removed the pattern by hand and there were not any visible cracks or damages as such. It was left for around 3-4 weeks for drying after that.
- There was no gating system although their was one cast which seemed to be perfect without any gating system somehow aswell.
- Before casting i put the mould in an oven for 3hrs and then 15 minutes of blowtorch on it. After that Aluminium melt was poured into it
For viva, our prof has told us to analyse the cast and talk about all the defects present in the cast and why it has formed
Im guessing the large one, its a blowhole but im not sure enough. Please help with it. Thank you! The last 2 photos are the pattern and the mould. I'll be attaching a video of the cast and the mould in the comments if its possible.