I can't advise on a welder but I can add,
A 220 line is very simple to install yourself.
No need for an Electrical Contractor if you own your home.
It's just three wires instead of two.
Make sure to use the proper gauge wire.
Two hot and one ground.
Have a look at some wiring schematics.
You might just want to add a line now.

Lots of reference online too.

http://www.askmediy.com/how-to-install-a-220-volt-outlet/

I have mechanical Aptitude.
I can screw up anything.