Definitely use the mig. Even a stick welder with thin rod would be good. I've made quite a few stands out of bed frame. When I lived in the city I collected them as they were pretty common to see thrown out. Just chop the ends off and you have some nice angle iron. Here's a pic of the corner of the stand I hunted out of yesterday.
I'm not a hunter, I'm a wildlife population reduction specialist !!
If it doesnt have wheels, swim or runs naked in the woods, I dont know anything about it.
Diamond Victory 70#, 30.5 Draw, Gold Tip XT, Thunderheads, Pendulum Site, Deluxe Tornado Release
Kawaski Brute Force 750, ITP Type 6 wheels, Dirt Devil Tires, Full skids, Shock covers, Warn Winch, Kolpin Box