If your just welding square tubing like your saying, I would stick to the flux-core.(My Opinion)
You can mace some decent welds, Just drag it smooth and steady and keep the slag and puddle the same size and width.
A grinder with a wire wheel, and some paint.
Gas, does make cleaner, prettier welds.
I would do what works for you.
~John
Just a couple welders and a couple of big hammers and torches.
Men in dirty jeans built this country, while men in clean suits have destroyed it.
Trump/Carson 2016-2024