Bump up the gas to about 20-25 CFH to get rid of the porosity, and concentrate the arc on the tubing as you're running the bead to get better fusion on that side. Make a little "V" or cursive "o" pattern as you progress with the gun and just delay a tiny bit longer on the tubing since there is more material there compared to the edge of the angle iron which makes it require more heat on that portion of the weld. Watch the puddle closely at all times to ensure adequate fusion on both sides of the weld. Controlling that puddle and watching how it whets in to both pieces of metal being joined is the key to a good weld.
Last edited by Spartan on Sun Apr 19, 2020 10:00 pm, edited 1 time in total.
I agree; it's your gas flow With the nozzle 3/16" from the base material, at bare minimum about 15CFH. If you still get the same results, then go up another 5 CFH. Etc. Etc. Then once you get zero porosity, you can tweak it 2-3 CFH at a time if you wish.