Question: Welding in pipe notch

[ca180]

So, I'm new to bagging and frame work and all the like. I've enjoyed tinkering with car and bike for a while, but never really went over to the fabrication side. So as far as a welder goes, all I have right now is a Lincoln that plugs into 120. Supposed to push like 130 amps though.

To get to my question, I'm sure that there would probably be issues with trying to build a step notch with such a small welder, but I plan on running air over leaf with a flip kit. So I was going to do a simple notch with pipe.

Do you guys think that I can get away with welding with my 120v welder? I do plan on boxing the back side.

Also, what size and thickness pipe should I use?

Thanks for any help