those are transformers. If you dont have an air chisel, set the transformer on the floor. At the weld up against the copper spool set an ax. Use a short armed sledge hammer to whack the ax. A few good whacks and the one side of the transformer will come apart and you can get the copper spool out. sometimes I just cant get them apart and I turn them in as is. If you have a vise big enough to hold the transformer while you whack it - even better!!