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Posted by Jim C Roberts on March 25, 2007, 7:58 pm
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Greetings all,
First of all, this machine is GREAT! The control in AC with the pulser is
incredible. After some initial problems with torches,(We did not need the
700 amp rated torch that came with the machine, 250 is working just fine.
Add to that the reluctance of our tool room guy to buy the correct set up,
we attempted to "Frankenstein" a set up together, need I tell you how that
worked out?) We are now rolling right along with one of the smaller 250 amp
Miller torches and life is mostly good.
Now for the question; When welding in DC, usually SS, I can not keep a
decent point on my tungsten. 3/32" 2% Thoriated tungsten, ground to "pencil
point" erodes like crazy, a simple 1 to 1 1/2X diameter or so grind yields a
slightly longer lifetime, but it tends to ball slightly and I lose alot of
arc control. Running DCEN with or without pulser doesn't seem to matter.
So, any ideas? Am I missing something in the directions or use of the
machine? As always, any and all help is greatly appreciated.
Regards,
Jim
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Posted by Brent on March 26, 2007, 12:29 am
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wrote:
> Greetings all,
>
> First of all, this machine is GREAT! The control in AC with the pulser is
> incredible. After some initial problems with torches,(We did not need the
> 700 amp rated torch that came with the machine, 250 is working just fine.
> Add to that the reluctance of our tool room guy to buy the correct set up,
> we attempted to "Frankenstein" a set up together, need I tell you how that
> worked out?) We are now rolling right along with one of the smaller 250 amp
> Miller torches and life is mostly good.
>
> Now for the question; When welding in DC, usually SS, I can not keep a
> decent point on my tungsten. 3/32" 2% Thoriated tungsten, ground to "pencil
> point" erodes like crazy, a simple 1 to 1 1/2X diameter or so grind yields a
> slightly longer lifetime, but it tends to ball slightly and I lose alot of
> arc control. Running DCEN with or without pulser doesn't seem to matter.
>
> So, any ideas? Am I missing something in the directions or use of the
> machine? As always, any and all help is greatly appreciated.
>
> Regards,
> Jim
What amperage level are you welding at? and how thick?
3/32" Red (2% Thoriated) Tungstens on DCEN usually have a recommended
amperage of around 200ish amps (miller tig documentation says 135-235)
Is the machine at full amperage and heavy pedal? or backed down to
around 200-250 amps if your TIG uses full pedal?
Pushing too much Current through a tungsten thats too small will make
it start to melt and erode the point I've seen it happen with 1/16ths
on my machines the size of tungsten is a factor in power handling as
is polarity.
If youre doing stuff that NEEDS the dynasty 700 over a dynasty 200 or
300 you might well be using too small a tungsten
There are experts ont he group who can explain it better but i know
from experience that the more amperage and heat is passing the bigger
the tungsten needs to be (Because AC and DCEP put more heat int he
torch the tungsten needs to be sized up too for the same welding
amperage)
Brent P
Ottawa Canada
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Posted by Gunner on March 26, 2007, 4:25 am
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>>
>> Now for the question; When welding in DC, usually SS, I can not keep a
>> decent point on my tungsten. 3/32" 2% Thoriated tungsten, ground to "pencil
>> point" erodes like crazy, a simple 1 to 1 1/2X diameter or so grind yields a
>> slightly longer lifetime, but it tends to ball slightly and I lose alot of
>> arc control. Running DCEN with or without pulser doesn't seem to matter.
Two questions...are you SURE its straight polarity? And are you sure
you are NOT using C25 mig gas?
I got a tank of "argon" once..that was mis labled. The CO2 burned the
electrodes off quickly.
Gunner
Political Correctness
A doctrine fostered by a delusional, illogical liberal minority and
rabidly promoted by an unscrupulous mainstream media,
which holds forth the proposition that it is entirely possible
to pick up a turd by the clean end.
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Posted by Ernie Leimkuhler on March 26, 2007, 3:22 am
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> Greetings all,
>
> First of all, this machine is GREAT! The control in AC with the pulser is
> incredible. After some initial problems with torches,(We did not need the
> 700 amp rated torch that came with the machine, 250 is working just fine.
> Add to that the reluctance of our tool room guy to buy the correct set up,
> we attempted to "Frankenstein" a set up together, need I tell you how that
> worked out?) We are now rolling right along with one of the smaller 250 amp
> Miller torches and life is mostly good.
>
> Now for the question; When welding in DC, usually SS, I can not keep a
> decent point on my tungsten. 3/32" 2% Thoriated tungsten, ground to "pencil
> point" erodes like crazy, a simple 1 to 1 1/2X diameter or so grind yields a
> slightly longer lifetime, but it tends to ball slightly and I lose alot of
> arc control. Running DCEN with or without pulser doesn't seem to matter.
>
> So, any ideas? Am I missing something in the directions or use of the
> machine? As always, any and all help is greatly appreciated.
>
> Regards,
> Jim
Try switching to Lanthanated tungstens and make sure your tungsten is
large enough.
If you are running more than 200 amps then move up to a 1/8" or even a
5/32" tungsten.
BTW at higher amps remove the sharpest part of the tip before using.
A tiny flat on the tip will reduce tungsten erosion at higher amps.
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Posted by Jim C Roberts on March 26, 2007, 10:16 pm
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news:stagesmith->
> Try switching to Lanthanated tungstens and make sure your tungsten is
> large enough.
I wish, Ernie. Unless I can get the Big Boss Man to say the word, our
before-mentioned tool room guy will not buy anything but what he has for 15
yrs. I have tried mentioning both Lanthanated and Zirconated, just got the
Deer-in-the-headlights look. GGRRRR!!
>
> If you are running more than 200 amps then move up to a 1/8" or even a
> 5/32" tungsten.
Sorry, I didn't mention the amperage. Mostly I am in the 80-100 amp
range, maybe 120 if I am welding a 1/4" foot to a piece of 1/8" wall tubing.
>
> BTW at higher amps remove the sharpest part of the tip before using.
>
> A tiny flat on the tip will reduce tungsten erosion at higher amps.
I am familiar with truncuating(sp) the tungsten for higher amperage, but
thanks for the reminder.
Thanks as always,
Jim
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>
> First of all, this machine is GREAT! The control in AC with the pulser is
> incredible. After some initial problems with torches,(We did not need the
> 700 amp rated torch that came with the machine, 250 is working just fine.
> Add to that the reluctance of our tool room guy to buy the correct set up,
> we attempted to "Frankenstein" a set up together, need I tell you how that
> worked out?) We are now rolling right along with one of the smaller 250 amp
> Miller torches and life is mostly good.
>
> Now for the question; When welding in DC, usually SS, I can not keep a
> decent point on my tungsten. 3/32" 2% Thoriated tungsten, ground to "pencil
> point" erodes like crazy, a simple 1 to 1 1/2X diameter or so grind yields a
> slightly longer lifetime, but it tends to ball slightly and I lose alot of
> arc control. Running DCEN with or without pulser doesn't seem to matter.
>
> So, any ideas? Am I missing something in the directions or use of the
> machine? As always, any and all help is greatly appreciated.
>
> Regards,
> Jim