Depends on a lot of things. Slickest work, but most expensive - TIG. Cheapest - arc (stick) welder. Reasonably user friendly and inexpensive - wire-feed arc/ MIG welder.) Most versatile - Oxyacetylene. Oxy will give have the biggest heat affected zone and is the hardest to use (IMO). If your kart is really thin wall tubing you can forget about the stick welder and even the MIG will be quite tricky.
with torches and a welder, you can make it into a monster truck if u want
sure but it will probably take longer than if you use a wire feed. you might have to cut the rod in half to get to tight places. and a stick welder might be to hot and burn through the pipe you use for roll bar
Maybe you can, it depent what weights is the go kart...
Steel tube makes the best frames
yerf dog
A Welder should go to Harverd are the sort
you dont want cheap you still want a good kart so i wpuld recommend $ 100
It really depends, it should fit, best thing to do is try it on, if you haven't bought it already.
Try Craig's List.
In terms of price and durability, this is the best professional engine.
personally, i recommend Yoshi in his egg 1 kart. but you should go with whatever you are best with.
At a go kart place