Did a little more tidying up and got the work bench cleared of so I could start making a mess. Full disclosure: this is all dirty metal (mill scale, rust, oil) from my boxes and boxes of scrap. I didn't clean F all. So the contamination was expected. I started on 1/8" and went down to 1/16", and tried 1/16" filler rod on both.
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All killer, almost no filler.
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Penetration!
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So far I've made some puddles, pushed some filler rod into some puddles, and mostly just fused metal together without filler rod by manipulating the base metal and the puddle. I deliberately tried using the wrong sized tungsten and amount of amperage to see what would or wouldn't happen. Mostly boogers and blow through. Dipped the tungsten a few times too - I just need to slow down and be more attentive. Lastly, I am not seeing the puddle as well as I would like - and I may be limited by my welding mask. I'll try the one I got Natasha for Christmas before getting another.
Overall not bad for an hour of farting around.