We are in the market for a TIG welder. We are hoping to be able to weld at least 1/4" aluminum. We have been looking at the Thermal Arc
185TSW but have the feeling that it will be difficult to use with anything over 1/8". Any experiences with this? We are now considering something larger such as the next step up Thermal Arc or the Miller Dynasty DX 300. I noticed that the non-inverter TIGs are less expensive. Do the inverter based TIGs perform better or is it just a combination of small size and less current draw that makes them so attractive? Current draw isn't a real issue for us. Any suggestions?