Bit late to add this, but heating is fine along as the tyre is not to close or under extreme pressure as it will blow, also welding is a certain NO GO!!!!!!! I know of someone and was a very clever and still is a smashing bloke, well known in the area, when working for his engineering company, doing a job one day, welding a extra rim on a tractor for dual wheels when the rim already on the tractor got too hot and blew the tyre up (literally) and very sadly blew the poor chap off his feet and chuck him against the wall on the other side of the workshop, the consequences being he now has to be in a wheelchair and cared for 24/7 by family!
Sorry to hijack this post, but don't want anyone on here to suffer this, as you will then know how much your machines will mean to you!
Glad to see you got the nuts off, some wheel nuts can be a right pain at times, yet some that look really bad will come straight off!
Kind regards
Henry