Miller Dynasty 350 - this is going to be an open root butt weld on aluminum.. I also want to mention there is a part in the video that looks like I am "scratch starting" lol., no.. sometimes if I cannot get connectivity, ill tap the aluminum and then ill try igniting the arc again.. just so you know.. I could have easily took something sharp and scratched the aluminum, making a bare spot that would easily ignite the arc.. pesky oxides..