www.weldingtipsandtricks.com this weekly video is in response to a lot of questions about HTP tig welders. Are they good? What is the max thickness of aluminum that an HTP invertig 221 can handle? etc…etc… So in this video, I got hold of an HTP tig unit and did some welding on .080″ thick 3003 aluminum as well as some really thick 6061 bar stock. I used a helium/argon mix for the thick aluminum and it got me over the hump.