Any advice?

[wheresmejumper]

Mild steel spits at the tungsten something terrible unless its completely clean.
looks like your using a flap disc to prep? If so try a plain grinding disc.

 

[PSweeney]

I'm far from qualified to offer advice as I'm still learning too.... To me it looks like your tungsten isn't sharp enough to begin with. I'd also come down on the cup size to 5 or 6 which will allow you to get the tungsten closer into the joint. You maybe losing the point bu being to far fromt he joint which is causing the arc to wander, equally you be compensating but running it too hot to get the puddle to flow. Sharpen the tungsten, get the arc tight to the joint with a smaller cup and minimum stick out and don't weave. This is what I would do, but again not qualified to give advice just my opinion as a fellow TIG newby

 

[Boss]

Ok taken all the advice on board, using a grinding disk, I've turned pre and post flow up, switched to the no10 ceramic, increased my gas flow a bit, was really carefull grinding my tungsten and what was only ment to be a tack went ok lol...

Going to get a toxic cup when there back in stock which should make things better.