Guys I wouldnt worry about running out and buying power tools left right and centre.

A welder, whilst a nice toy, is only useful if you use it correctly. True I taught myself to weld but I always use a bolt to support a weld in some way as I am never 100% confident in my welding skills.

To be honest, If you have a power drill, a good set of drill bits, a set of screw drivers and something to cut with (hack saw, jigsaw, grinder etc) then you are pretty much sorted. Everything else is just a bonus.

What makes building bots interesting is seeing what you are able to do with the resources and knowledge available to you.

FYI my arc welder was £30 out of macro and has yet to fall to bits