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Posted by on March 23, 2008, 6:44 pm
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> On Sun, 23 Mar 2008 08:26:31 -0700 (PDT), RichD
>
> >Are you SURE the argon is on and the bottle HAS argon in it?
> >Can you hear the gas blowing at the torch when you push the pedal
> >down?
> >NO argon = a mess when trying to TIG weld.
>
> Definitely check the gas flow, though the original description "the
> tungsten keeps melting into a ball" is more consistent with incorrect
> polarity. Without gas the tungsten will erode irregularly in a
> blackened mess.
>
> As Rich says, don't check polarity with a meter unless you're sure the
> hi-freq is off.
>
> I'm not familiar with this machine, but it sounds as though polarity
> is determined by the machine based on the setting of a process
> selector switch? In that case, try setting the machine for stick
> welding DCEN (straight polarity). If you still melt the tungsten, try
> DCEP. Presumably that will disable the hi-freq start, but you can
> still scratch start, and perhaps get some clues as to what's going on.
>
> --
> Ned Simmons
I check the electrode voltage and its negative 16VDC. The maximum Amp
set is 70. The diameter of the electrode is 3/32. Am I just using too
small of an electrode. The sheet metal thickness is roughly 0.065.
Argon is flowing with a 7 second post setting.
Thanks,
Luds
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Posted by Ned Simmons on March 23, 2008, 7:09 pm
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On Sun, 23 Mar 2008 15:44:05 -0700 (PDT), daluds@charter.net wrote:
>
>I check the electrode voltage and its negative 16VDC. The maximum Amp
>set is 70.
Under what conditions? 16V is very low. I'd expect to see 60V to 80V
open circuit, perhaps 30V while current is flowing.
>The diameter of the electrode is 3/32. Am I just using too
>small of an electrode. The sheet metal thickness is roughly 0.065.
>Argon is flowing with a 7 second post setting.
1/16 is the right tungsten. 3/32 is too big.
--
Ned Simmons
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Posted by RichD on March 23, 2008, 8:26 pm
Please log in for more thread options Luds,
OK, I think I see your problem. That small of electrode can only
handle very
small current. Too small for 1/16 steel sheet.
I hate to disagree with Ned, but a 1/16" tungsten is awfully small.
For most work the 3/32 size thoriated or cerium is best.
Keep it well sharpened to a point for welding steel. About 30* is
fine.
Anytime you are melting the tungsten, the current is way to high for
that size.
For welding aluminum, use pure (green) tungsten. Form the ball on a
blunt end.
Typically 1 size larger than steel.
I am a student at a Tech College, but have been welding for many
years.
Owner Miller Syncrowave 250.
RichD
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Posted by Ned Simmons on March 23, 2008, 10:50 pm
Please log in for more thread options On Sun, 23 Mar 2008 17:26:03 -0700 (PDT), RichD
>Luds,
>OK, I think I see your problem. That small of electrode can only
>handle very
>small current. Too small for 1/16 steel sheet.
>I hate to disagree with Ned, but a 1/16" tungsten is awfully small.
>For most work the 3/32 size thoriated or cerium is best.
No harm in disagreeing, but you're way off here. A 1/16 thoriated
tungsten is good to well over 100A on DC, at least twice what's
necessary for welding 16 gauge steel. For stock thinner than 16 gauge,
I'd be thinking about switching to a .040 tungsten.
There's a chart on this page:
http://www.thefabricator.com/AluminumWelding/AluminumWelding_Article.cfm?ID=527
>Keep it well sharpened to a point for welding steel. About 30* is
>fine.
>Anytime you are melting the tungsten, the current is way to high for
>that size.
>For welding aluminum, use pure (green) tungsten. Form the ball on a
>blunt end.
>Typically 1 size larger than steel.
Better go at least two sizes larger if you're using pure tungsten.
>I am a student at a Tech College, but have been welding for many
>years.
I made my living TIG welding for many years.
--
Ned Simmons
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Posted by Don Foreman on March 24, 2008, 12:46 am
Please log in for more thread options On Sun, 23 Mar 2008 17:26:03 -0700 (PDT), RichD
>Luds,
>OK, I think I see your problem. That small of electrode can only
>handle very
>small current. Too small for 1/16 steel sheet.
>I hate to disagree with Ned, but a 1/16" tungsten is awfully small.
>For most work the 3/32 size thoriated or cerium is best.
>Keep it well sharpened to a point for welding steel. About 30* is
>fine.
>Anytime you are melting the tungsten, the current is way to high for
>that size.
>For welding aluminum, use pure (green) tungsten. Form the ball on a
>blunt end.
>Typically 1 size larger than steel.
>I am a student at a Tech College, but have been welding for many
>years.
>Owner Miller Syncrowave 250.
>RichD
I'd say try a different tungsten.
I did some welding last week on 3/16" steel using a 3/32" lanthanated
tungsten, running well over 150 amps to "get 'er going" because I
wanted to be done in 15 seconds and quench before the heat got to
plastic about 1.5" distant. No problems at all with the tungsten.
(No problems with the plastic either.)
Miller Dialarc 250 HF, DCEN.
I like zirconiated tungestens much better than pure tungsten for AC on
ally.
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