Hi ,

im new here but been welding for a couple years now , just purchased a brand new everlast powertig 185dv to practice some aluminium tig at home. first out of the box did some steel bead trying everything on the dc side of the machine ( worked perfect as expected from a brand new machine ). then try the ac side of it, now the fun begins, did a few bead noticing something strange like if mid weld the arc will suddenly go off and back on in a unstable fashion. at first i tought it might be me but i didnt dip the tungsten at all. so i started the idiot check list from the top , made sure that my ground is good ( undo the dinse plug tighten the lug and did a ohm check with a meter on it ( perfect result ) ) , did the same with the torch lead, next i made sure i had no leak on my argon line and double check for cfh, next tried both with gas lens and standard cup , tried both with the finger switch or the pedal , same result . the arc start good with th HF and then start stuttering . the longer i watch the arc going crazy i realise that the arc does not really go off it kinda stay on very low and then like a pulse go back up again in a non stable action. And then i realise that at the very momment the arc go down i can see the ball on the tungsten beeing formed and pull to the material as if the arc lost is dcen side and became only dcep for a second ( pulse is off btw) .To add to the weirdnest if i start the arc and start moving right away it seems to help keeping the arc constant ??? but still do the stuttering after 3 inch of weld. At this point i contacted everlast support ( wicht was very quick to respond ) and they made me do the idiot check all over witch i did ( cause i really wish this is an operator error and not a machine issue ). im looking for some more insight here. i already found forum with the same exact problem but no answer to the problem except they had to ship it back paying for the shipping. i mean its a brand new machine. hope you can help me here maybe i overlook something, hope im the dumbdumb here.

here is a video off the probleme just trying to get a pubble going : https://youtu.be/Uy_7EcKbw3U

and setting and setup :
plug on 120v
80amp on AC
3/32 , 2%lanthanated tungsten ( blue)
1/16 stick out electrode
1/16 tips to work distance
25cfh
100% argon
no.5 standard cup
pulse off
30%cleaning
150Hz