I scribed a centerline on it and started sawing it in half.
Outside first then the inside
I stuck some magnets to it and held it to the edge sander to knock off the high spots.
Lot's of kerf cuts and started welding
This took a long time.
I welded it up and started grinding the welds.
More tomorrow
This carbide scribe (on the right) has a small magnet on the end and gets everything stuck to it magnetized, so I ordered a Demagnetizer.
You hold the object in between your fingers (to keep it off the top) and drag your finger tips from one side to the other. When I did tool and die work we used magnetic chucks to hold down parts as we ground them on a surface grinder and Demaged them after.
Done, I even tried to demag the small magnet but it did not work.