Welding Aluminium?

[seaton]

Hi, I’m in the middle of a little project that requires the joining of a Range Rover roof, I’ve tried spot welding with no success, so now i'm down to either bonding, riveting or welding. I have a MIG welder that will take 0.8mm aluminium wire, and just wanted to know if any one has tried this with any success or has any tips.
cheers
Rich