A quick google search came up with several results including this: https:// goo.gl/Lp3XLK "5F Welding Test - Not Common - And Not Easy". Specifically, this article is about stick welding, but still, I think the principals appl y. I doesn't sound like fun at all.
The one video I watched showed a guy doing it, but with the plate horizonta l, and he just gave it a quarter turn a few times. That's too easy.
Can you initially set-up on plate? Set-up on a plate T-fillet test-piece?
I know that plate constant conditions "should" be close to what happens on a pipe at the "clock-face" position which has locally the same inclination - but in reality that isn't the case - it's only approximately so.
On the other hand, to get a rough idea where to start...
Can anyone say whether this helps and sort-of works?
Initially you could find a "dip" setting which is the lowest which fuses in the horizontal-vertical (2F/PB) position.
On the same setting - voltage-tap and wire-feed-speed;
Try that you can run it with fusion in the 4F/PD position
Try in the 3F-up/PF position - can / how-do you control at that setting?
Iterate if necessary adjusting up or down the power (V and WFS).
Would that put you somewhere close to the condition you need for the pipe-fillet 5F-up / PH weld?