So about 3/32 to 3/16 inch thickness.

Current ranges will be about 1 amp per thousandth of an inch so roughly 100 - 200 amps for fillets (assuming a foot pedal control)

Voltage will vary with arc length... I suppose 18-23 is about right... But it is not critical to the deposit unless you are going automated and the arc voltage controls your Z axis... In this case getting exact arc voltage numbers is critical... As is tip geometry.

But as far as current and voltage... The rules of thumb you have for austenitic stainless will apply with a negligable difference in my opinion.

This variable depends greatly upon a number of other factors.

1) The joint design, a square groove, no gap can handle more heat than one with a gap or bevel. This is related to the welders skill. A tee or corner joint can hadle even more heat.
2) The ability to control the travel speed. At 210 amps a slight pause in the travel could cause problems. 210 Amps with a hand held process will require the welder to move on quite quickly.
3) The position, This setting may work ok flat but could be a little harder vertical depending upon the bead size.

I would try the settings and see what happens. Develop your procedure around what works.

Gerald

I would say that arc voltage of 18-23 is very high for GTAW.  Depending on set up, i.e., cable lengths, grounding, etc., GTAW arc voltage should be in the 10-14v range.