Mike,
For the purpose of my last post.. "Hybred" means independent control of amperage on both sides of the AC half cycle.
Another term is Aysemmetric
With this feature you can set amperage and dwell time for DCEN and DCEP independantly.
For example... The aluminum project I welded was 1/4 inch thick... A 3/32" lanthanum electrode usually won't hold up for a job like this without degrading at the tip... But with the Dynasty (or Aerowave) I could set my currents as follows.
140A DCEP 40% Dwell time
205A DCEN 60% Dwell time
200 Hz AC frequency (to keep the arc more columner, with better directional control in fillets)
This combination provided me with sufficient DCEP to etch the work and keep the puddle shiney.. The Extra DCEN provided the punch to melt that 1/4" Aluminum without ruining the end of my electrode... The tungsten did not keep the point I started with, rather it rounded it off.. It did not expand the tip larger than the original tungsten diameter however.. Pedal to the Metal most of the time on that particular job.
With older technology a larger diameter electrode would have been required and a much fatter fillet profile would have still been the result.
Try to envision two different power supplies you can control independantly, One DCEP the other DCEN...
While Dynasty 700 offers some advanced waveshapes (Advanced Squarewave, Soft Squarewave, Sine Wave, Triangular Squarewave) The Advanced or "true" squarewave setting is what you would normally select for GTAW work.. The Soft Squarewave will immitate a Synchrowave 250 type output.. A Sinewave output would go further to reduce peak time at selected current levels and the Triangular squarewave is a silly option that has no practical use in fabrication or repair.. It can be employed to actually cut aluminum because the arc is so harsh.
Edit: Here is information from Mike Sammons of Miller Electric. A series he wrote a few years ago called "Aluminations" It has 3 tig parts and two GMAW parts...
http://www.millerwelds.com/resources/articles/index?page=articles42.htmlThis page has links to video overviews of the control pannel for Dynasty 700 and another for it's advanced functions
http://www.millerwelds.com/products/tig/dynasty_700/