If you are welding brackets or ali bodywork together then give Lumiweld a try. The kit is available from
www.frost.co.uk (welding) and it's very good.
I have welded stuff together with success, even a bracket to an ally heat shield on a Caterham in race trim and it's still Ok after many many track miles.
Highly recomended kit and all you need is a blowlamp.