hello i'm new to the aws forums and i have an issues with my Eastwood tig ac/dc 200. this issues is did not happen until i ran out of argon and got a new tank. the post flow and preflow are fine but the actual gas flow when welding is non existent. all of the connects a seem fine and before  i swapped the tank my welds were close to perfect. for being self thought for 3 years. does anyone have an answer for my dilemma?