Yeah,

Without you posting your exact settings used, guessing is to be expected.

But, absent a machine problem, you undoubtedly only have a setting problem.

I'll guess that your AC balance is too low. Set it to 40% AC cleaning action and you'll probably get your aluminum starting back. And like Rambozo suggested, just dwelling over the piece with the torch is probably creating your problem, and some agitation may help.

Please let us all hear how it goes or if it was just a matter of settings.

Quote Originally Posted by Blaze View Post
My 250EX won't start a puddle in ac mode. Just heats up the metal until it warps and makes a hole. Material thickness doesn't matter. Frequency, argon, balance and amps don't matter. Machine grounded to its own additional ground. Not grounding issue. Noisey Arc in ac mode. DC mode quiet arc and runs nice bead. Not tungsten or tungsten distance issue. Machine only in use a little over a year and sparingly. Need to talk to a tech or someone who had the same issue. No guessing please. Need technical expert. Tired of wasting argon and have work to do. Thx