That looks like mig welding without any gas! Looks like a gas issue, even if you penetrate right through and get the metal hot the worse thing that’ll happen is the weld will become horribly contaminated but it will still resemble a tig weld. Provided you don’t touch the work with the tungsten and your post flow is adequate the tungsten should stay clean too. I’ve welded quite a bit of steel which wasn’t cleaned properly (lazy more than anything) and it always comes out fine for the application, even if it’s a bit discoloured.
As mentioned, check the set-up for leaks first and go from there. You should be able to establish a nice puddle without adding filler
As mentioned, check the set-up for leaks first and go from there. You should be able to establish a nice puddle without adding filler