When TIG welding aluminium alloy, on a Migatronic 220 AC / DC TIG machine, i know that i should be using a tungsten that has balled. However, if i take a new ceriated tungsten from the box, sharpen it, flatten the tip to say small "flat", can I then immediately start alloy welding with it, or should I ball it first, maybe on some scrap alloy?
Secondly, I have welded some -10 weld on Aeroquip pipe fittings to an alloy cam cover on a race engine. The weld on fittings are about a 1/4 inch thick on the boss for welding, and the covers a similar thickness. I ended running about 100 amps, and my 3/32 tungsten has started to erode. Is that too much current / too thick a material weld for that size tungsten?
Thanks.