Another option for outdoor welding is flux-core wire. Run it in your MIG with the polarity reversed and no shielding gas. Popular among hobbyist for it's budget and simplicity (no gas bottle) and farmers for being able to work on stuff out in the wind.
I'll let you do your own research on the details. But I'll just say that it looks like a big steaming pile until you hit it with a wire brush and not the slag off, then it looks like a proper weld.
YouTube is great for learning.
Matt
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