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TGR
@Jung
I'm getting handier with the torch too. You invariably end up with a couple of small gaps as the sections go together and the metal pulls this way and that. 20ga is only 0.9mm thick, so gaps are an anathema - it's easy to burn the edges away and blow a nasty hole. If you're deft, you can add a little filler, I use 30thou mig wire but that is bloody tricky as it burns like a fuse popping at the slightest whiff of heat. You can also wave the torch around laterally in front of the weld to squeeze the gap shut, if you do this and quickly give the weld pool a little flick, you see molten metal shooting up to fill the gap just in front of the main puddle. Very satisfying.
OK, weld nerd off.