Help me to choose AC/DC TIG WELDER

Inverters weigh much less than transformers. They also cost more.
If you can afford it, the Dynasty 200DX is a beautiful machine.
The Thermal Arc Prowave 185TSW is also a lightweight invert and costs about $1000 less than the Miller Dynasty 200DX.
You haven;'t said what you plan on welding. Are you in the US, Europe or Japan

I am a Jewelry designer and maker who is living New York. I have plans to make lamps, pedestals, side tables and things like small household goods in all kind metals. I would like to know which company makes The Thermal Arc Prowave 185TSW.
Thank you for advice.
Yoshiyuki

Thermal Dynamics makes the Thermal Arc machines.
Here is the TheralArc link off the web site: And here is the link for the ProWave 185tsw: I hope this helps,
rvb

(...) The welder I have weights 8.4 Kg. Tig, AC/DC, 210 A max (175 A at 100%), sequencer and pulser built-in. It is built by Rehm in Germany. They have a less powerfull model (also AC/DC, 170 A max) at 7.8 Kg.
So lighter models do exist.
Please note that I am not saying you should buy this particular model. Although it is a very nice machine, it is probably not properly distributed in the US and one does need reasonable service and distribution for such equipment. It also is 220V only. But if you want to enquire about it, the web site is and the name of the machine is TIGER210 AC/DCDIGITAL.
What I would suggest, however, is that you do a little more research if you want a very light machine. There are quite a few makers besides the obvious ones you cited. The magic word here is "inverter" and manufacturers include firms like Cebora, Selco, Merkle, Panasonic, Fronius, HTP, and probably a dozen others whose names fail me at present.