I remembered reading one of your post about welding Inconel's with asymmetric GTAW... thought I would try it on AR235... It didnt work out so well...the results were... weird. The scale kinda etched away but the puddle was really rough and was basically like welding through the scale (gee I wonder why...
) That was a little while ago.
So with the first questions answered I tried another test...
After this post I tried it again but this time I ground the mill scale off.
Thanks to the Dynasty's memory functions I ended up some where near my original "test"
I was around 200 amps En, 90 amps Ep, 99%En, 400hz.
Plate was ground shiny, W was clean with a slight taper and a blunted end (2%cer 3/32), #7 gas lens. I forgot to check which scale the flow meter was at... I believe cfh but the ball was right around 20.
I couldn't bring the AC weld above half power without the puddle developing a bright green glow and lots of porosity and the W suffered quite a bit of deterioration. It really didn't seem to like it at all... I think the original test over full scale fared better...
So I switched back to DC and ran a bead on the other side of the plate to make sure something else wasn't wrong.
Apart from outrunning my gas coverage the DC bead ran fine.
I have more pictures if anyone wants, and the same sample.
I have a feeling I set the Ep side too high on the AC side... I'll try again later.
Thanks for the replies
Clif