Quote Originally Posted by cmd View Post
I have been watching this thread with some curiosity as I just got a 250ex and I will be welding some nice finish aluminum to some capacity. I've checked my serial number and I am not listed under the defective machines, however I too am not sure that I have full range on the balance. I cannot make my etching go away, If I turn the balance the whole way up (clockwise) it balls the electrode, possibly melt it if I went the whole way. Completely Down (counterclockwise) It welds nice but the etching is still there, it seems you can only weld between 12:00 and the minimum. I suppose I will have to check in to the tech guys to see what is going on.
After I posted this I had an idea, I started to slightly tweak my argon regulator, and I really thought my argon consumption was high to start with, well I wonder about the accuracy of the reg, I was at 7 like suggested and couldn't make the etching go away, now I am down around 5 and sometimes I can make it disappear completely, mostly its about a 32nd wide but you have to keep rolling and not let the head build up or it will show back up, I think I can handle this, I will have to try it on more jobs.