I've got a new Dynasty 200 DX and I'm having problems with getting the arc started on some .080" aluminum I'm welding. When I have a freshly ground tungsten, it will start as normal (I'm using a foot pedal), but after the first use, the tungsten will get a small ball on the end and then the arc doesn't want to start again. It will just make the frequency ticking sound and get some static arcing, but not get going like normal. I'm using a 3/32" tungsten, with the AC balance on 60 and frequency on 130. If I start moving the torch around (increasing the distance to the aluminum) it will sometimes start. I'm running about 145 amps max setting.

Any ideas?