Very Low Power TIG

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I just repaired my wife's glasses using TIG, on my Dynasty 200DX, and was wondering if anyone had any hints on TIG at very low currents.In her case, my son had snapped the temple, about 1/4" behind the hinge, and I was looking for a temporary repair that was better than tape.  I sanded the metal's coating off, and the broken pieces fused nicely with my machine set to 12A.But, that got me curious.  My machine will accept settings as low as 1A on the dial, but when I tried melting around the tip of some filler metal, the arc wasn't really stable below 5A (it kept flickering on and off).  This was with 1.0mm (0.040") 1.5% lanthanated tungsten, with a pencil angle point.So, I guess my question is, would the arc be more stable with a 0.5mm (0.020") tungsten, that is ceriated, or have I hit the lower limits of my machine?
Reply:You could be close to the low limit for manual welding.  A smaller electrode would help in theory.  Maybe if you had an automatic set-up with a fixed arc length you would have better luck.  We used to weld .002" titanium at a couple of amps with some Weldlogic power supplies, but those were designed for extreme low current applications and used fixed arc lengths in a lathe rig.  It is for sure possible in theory to weld at very low power with the right set-up.  I have done it.
Reply:The only way would be to build it yourself with the parameters you need, not impossible their are alot of DIY tig welders out their, what was the material?