I tried to weld a piece that broke off the electric motor of my lathe back on. The first part of the weld went really well and the old cast aluminium was way better than I expected. I TIG weld plenty of regular steel and stainless but I don’t have much experience in aluminium welding. On the first part of the weld I could see my tungsten and the gas nozzle glowing red hot after finishing the weld. Also my tungsten balls up comletely and it gets super brittle at the tip. When I go and regring it the tip just breaks off. I then tried to weld further and had to turn the amps up a bit (before was 140, then 150), thats when the tungsten and the nozzle got so hot that they melted. What could cause these problems? Could it be too little gas flow?