Unfortunately ARC welders don't handle thin metals all to well, great for thicker stuff though.
If you come across a small mig 120-180amp in your price range grab it I paid 175 bucks for mine. Gasl mig is superior but you can get away with gasless (tiz what i use)
I'm afraid to say your doing it hard using an arc even an experienced welder wwill find it trying with ARC and bicycle tube IMHO
I wouldn't even attempt it myself and i been welding for 20 years ...
Best of luck
KiM


