Hey man, it will be alright, just burn it on. They all do that. I would not put any strap in there, you dont want to burn the hanger to the strap more than the frame. I would just stich weld it, front, back and sides.
Here is what I did. It is hard to tell in the pic but as you can see I have D-Rings on the front of my frame area. I wanted to strengthen the hell outta my frame and the hanger area so I welded a piece of plate to the frame and the hanger, it is pretty damn thick, not sure anymore what it was though.
It really strengthened it up, then I welded my D's to the plating.
