Broken bolt

I would be careful welding around that aluminum. It doesn't take much heat to melt it. My go to method is to use an angle grinder to square up the broken bolt, center punch it, drill as large a hole as I can without buggering the threads, screw in the easy out until it catches solid, heat up the area with a propane torch and then try to turn the easy out in earnest. It has worked for me many times without breaking the easy out. Before doing it this way I had broken a few easy outs. Good luck!

Jack