Re: Flux-core/MIG for frame welding?
I use a stick welder for the low cost of consumables. I find the tips and gas are always gone when I need to weld and I'm cheap.
$6 bucks for a box of rods and I can weld for months.
But the welds are much harder to get right and pretty than a Mig.
Fluxcore is a compromise that works okay, especially in windy outdoor conditions but is nastier looking and harder to control.
TIG is by far the strongest and nicest welding process but it does take longer and is more expensive to buy and keep running.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.