^^^^^^ excellent advice!
I used to go to the Metal Super Shop -- and buy scraps -- I'd get a nice pile and then make 'em a deal. I'd get squares and rounds and thick and thin wall - etc Steel - SS - Aluminum.
Then I'd go home and weld on 'em. See what they did - learn how to clamp - see how they warped. I'd to butt welds - corners - insides etc. Learned where the stick out of the tungsten needed to be. Welded with different sized tungstens.
I agree with JR that the weld looked cold -- and that the piece with the bead left on it was partly welded but the other piece was most likely cold.
If I was welding this joint - my heat would have been directed at the base and I'd have let the residual heat and filler climb the cut end tube. It would take very little "motion" to get the cut end puddled and taking filler. The heat needed to go into the base joint tube.
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