Tig Aluminum

[Trev-m]

I would like some help setting up my welder for Aluminum.

I have been welding 3/16 X 1" flat bar.
I can't seem to get any consistency. One pass works well and I can get a nice puddle and the filler rod melts in fine. The next pass everything bubbles or generally looks like crap.

I have a
Lincoln precision TIG 185
output at 175 on AC
Gas - pure argon
Pure tung electode 3/32"
Fequency on high
AC balance on auto

I use a stainless steel brush to clean the Aluminum.

Thanks for the help

[turboblown]

If this is 6xxx alloy flatbar from Home Depot or such a store, I 've had this same problem. No matter what you do, there seems to be no consistency to the weld.

[eburgblue]

Are you recleaning after each pass? I have had problems like that and found that I needed to clean every pass before attemting the next.

[Trev-m]

The Aluminum is 6061 -t6 from a metal supply store.

We clean everytime we weld.