PDA

View Full Version : Tig problem



madmaxxx
04-01-2004, 01:25 PM
Hello,
I purchased a Thermal Arc 150gts inverter tig from an auction about a month ago. I'm not very good at tig, but know the
basics. I noticed the arc on the tig wanders. It wanders a lot.
The cup also gets very hot. I cant control the arc direction at all. Ive tried different tungsten(just incase one was cracked) and still no go.... The tank of argon I've been using is fairly old( over an year old) and the torch is air cooled.
Any suggestions??

Thanks

twinturboc10
04-01-2004, 02:58 PM
How did you grind the tungsten? I have noticed that if you don't grind it right, or dip in the puddle that the arc will wander. Those are the only easy things to check that I know of. Maybe someone else has more ideas?

madmaxxx
04-01-2004, 03:15 PM
Thanks for the response, twinturboc10--
I've used both pre ground and ones that I ground my self using
a belt sander. I've never had issues in the past with grinding tungsten.

bomberz1qr20
04-01-2004, 04:59 PM
Originally posted by madmaxxx
Thanks for the response, twinturboc10--
I've used both pre ground and ones that I ground my self using
a belt sander. I've never had issues in the past with grinding tungsten.

Grind it lengthwise to a pencil point.

What's your flow on the argon? The argon lowers the resistance across the arc and stabilizes it, not enough flow and the arc gets funny. Too much stickout keeps the arc out of the available flow too. Put the tungsten at minimum stickout and turn up the gas a bit and see if this improves the arc quality. Maybe start with 20 cfh and back off till the arc gets screwy.

ddsmith
04-01-2004, 05:39 PM
Are you welding indoor or outdoor? The wind can sweep away the argon and cause a screwed up arc. Ask me how I know? It really stinks when your item is to big to come inside and you have a wind that comes and goes.

madmaxxx
04-01-2004, 05:59 PM
argon flow is 15. i weld indoors.
ill try all of the above. Thank you all.

also... anyone know of any good welder
repair shops in socal. Im in L.A.

craig
04-03-2004, 08:59 AM
uhhh, no one mentioned polarity. you do have the torch negative right? if you have it positive, it will do what you described.

madmaxxx
04-12-2004, 11:38 PM
Ok! I tried everything I could and no go...
I took it to a welder repair shop near by and
I just got the phone call today.
"your welder will cost $876.43 to fix" the guy said
that there is no load. no load(wtf does that mean)???
he said the main board is gone.
I bought the welder(thermal arc 150gts) for $800.
I dont understand. Is it possible for the main board
to be gone and yet still produce an arc which balls
up the tungsten and over heats the cup??

and last but not least Does anyone know of any good
welder repair shops in socal???

anyone want to buy it...giver me an offer

Thanks again....
:realmad:

craig
04-13-2004, 09:26 AM
i don't think i would repair it. atleast not there. thats way to expensive for my taste.