>>2900660
When weaving or walking watch the edges of your puddle. Ensure they're inline with what's just frozen. Usually you focus on one side and the other one will sort itself out from just natural movement(assuming flat welding and consistent feeding).

I'd just practice little weaves with no filler on thin stainless sheet(1/8th or less). So you can run a lighter shade and really see what amperage, arc length and travel speed does. Stainless color will give you a better indicator of how much heat you're dumping into it.

>>2900690
>aluminum
>cheap

Aluminum is expensive to weld. Tig you'll need AC and amperage. Most cheap machines will have neither. And if they do they sacrifice quality or something else to get them.

For mig(wire), Spool Guns attachments are an extra cost on an already noncheap welder. And now you'll need another gas bottle.

If you're deadset get a cheap Tig Welder with AC and a bottle argon. It will teach you the most about welding. You will need 220v to do aluminum.