Tig problems

admin

I have a lift start DC tig setup with a 17 torch and 80cf argon tank.  3/32" 2% thoriated tungsten.  This has suited me perfectly well for learning and playing around with.  It's been a few months since I've used it though.  Yesterday I fired it up to do a little welding on 1/8 inch steel and immediately balled the tungsten.  It felt like no argon so after checking things I have my flow meter set to 20cfh, I can hear gas coming out of the torch but something still ain't right.  I checked the amount left in the tank and I was down to about 300psi.  Don't remember the exact starting point but I think when I got the tank it was over 2000psi.  So obviously I'm getting low.  is 300psi too low and would this cause the problem?  Also is there a chance the last remaining argon left in the tank could get contaminated or be less pure?  I have no clue as I'm grasping at straws.  What I do know is that it's worked perfectly fine prior to it sitting 2-3 months.Sent from my SAMSUNG-SM-G870A
Reply:300cf of argon is plenty. dumb question but is it set on proper current?i.u.o.e. # 15queens, ny and sunny fla
Reply:Was it balling the tungsten or eroding/burning it? If its balling you have the wrong polarity, it should be straight polarity (electrode negative).Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:Damn!  You guys are right.  THe last time I used the machine was in stick mode DCEP and I forgot to switch over the DCEN.   Amazing the simple things that get overlooked when you don't use things every day.  Thanks again guys.Sent from my SAMSUNG-SM-G870A
Reply:always check the easy thing's first.i.u.o.e. # 15queens, ny and sunny fla