Originally Posted by
Celika
Hello !
I'm looking for a budget "frame assembling" way (~450€ max all included), more adapted than my MMA inverter wich is very hard to use for steel under 1,5-2mm thin.
The MAG with Co2 seems borderline on thin steel because of high penetration and poor control.
MIG/MAG will be fine on 1.5-2mm, probably using 90% or 95% Argon. Certainly much easier than MMA. If you want to do chromoly tubes (around 0.6mm to 0.9mm on bikes) you need TIG with a foot-pedal. Many cheap mild steel bikes are MIG welded from the factory, often by robots.
The brazing idea also sounds fun, but MIG is probably easier and will make nice strong joints.