Experimenting with Arc

I haven't been doing any experimenting or building anything lately. I wish I had a shop to tinker in but non so far other than a garage full of stuff. I have been welding with my grand-dads arc welder and came across an idea of maybe figuring out how to widen the arc to melt metals. I still think if you can rotate a drum with considerable of RPM you can possibly separate metals in a liquid state??? Still invetigating but still have'nt found my answer. If anyone has a suggestion give me some insight to ponder.