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Posted by Boris Mohar on May 1, 2006, 11:25 am
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Hello,
I have been TIG welding stainless long enough to get a hang of it but I
still consider myself a novice. I have bee quite successful last year making
this http://www.viatrack.ca/TURBOMAN/ and now I am attempting to finish it.
I encountered the following arc behavior problem. Occasionally as I strike
the entire tip would be enveloped in a blush glow. The arc would strike but
initially it would not be concentrated on the tip but it would seem to be
coming from the entire front end of the electrode. Eventually it would drop
down and emerge from the tip. This behavior started last year and was rare
but now it is getting worse. Yesterday after some successful welding it came
back wit the vengeance. I could not get the stable arc at all. It would
buzz and hiss loudly and really jump around. The electrode would glow
noticeably brighter and it would wear rapidly. There would be sooty deposits
in the strike area. At its worst the arc would emerge as a jet of blush
reddish plasma from the entire cup destroying the lens in the process. There
would be copper deposits on the sides of the tip and in one spot on the side
tungsten looked really shiny. I took the torch apart and reassembled it. The
problem went away but is showing signs of coming back. Is this a classic
symptom of something or a weird combination of novice errors?
The machine is Lincoln Squarewave 175
The torch is T-9
average current is 80 - 125 A DCEN
The electrode is 3/32 Th
Here are the pictures of what the damaged tip and lens look like.
http://www.viatrack.ca/Misc/TUNG_UN.jpg
http://www.viatrack.ca/Misc/LENS_UN.jpg
Regards,
Boris Mohar
Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca
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Posted by on May 1, 2006, 3:19 pm
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It sounds just like what happens when you forget to turn on the argon.
My guess is its a gas flow problem- either you forgot, or the valve was
sticky, or there was some teflon tape in the hose, or a kink, or
something along those lines.
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Posted by Boris Mohar on May 1, 2006, 3:50 pm
Please log in for more thread options On 1 May 2006 12:19:36 -0700, rniemi@fidalgo.net wrote:
>It sounds just like what happens when you forget to turn on the argon.
>My guess is its a gas flow problem- either you forgot, or the valve was
>sticky, or there was some teflon tape in the hose, or a kink, or
>something along those lines.
I have plenty of gas. I can feel it coming out and I have used half of the
bottle without this problem.
--
Boris Mohar
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Posted by Boris Mohar on May 1, 2006, 6:40 pm
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>On Mon, 01 May 2006 13:46:41 -0500, Jon Elson
>
>>>
>>>The machine is Lincoln Squarewave 175
>>>The torch is T-9
>>>average current is 80 - 125 A DCEN
>>>The electrode is 3/32 Th
>>>
>>>Here are the pictures of what the damaged tip and lens look like.
>>>http://www.viatrack.ca/Misc/TUNG_UN.jpg
>>>http://www.viatrack.ca/Misc/LENS_UN.jpg
>
>
>Redish jet of plasma? From the pictures and the text...my first guess
>would be a bad tank of gas.
>
>The electrodes reminds me of the time I stuck a tank of C-25 on my
>tig, not knowing any better...cringe..blush....years ago..of course...
>
Cannot be. I used half of the bottle before it got this way.
--
Boris Mohar
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Posted by Don Foreman on May 2, 2006, 2:25 am
Please log in for more thread options On Mon, 01 May 2006 11:25:02 -0400, Boris Mohar
>
>Hello,
>
>I have been TIG welding stainless long enough to get a hang of it but I
>still consider myself a novice. I have bee quite successful last year making
>this http://www.viatrack.ca/TURBOMAN/ and now I am attempting to finish it.
>
>I encountered the following arc behavior problem. Occasionally as I strike
>the entire tip would be enveloped in a blush glow. The arc would strike but
>initially it would not be concentrated on the tip but it would seem to be
>coming from the entire front end of the electrode. Eventually it would drop
>down and emerge from the tip. This behavior started last year and was rare
>but now it is getting worse. Yesterday after some successful welding it came
>back wit the vengeance. I could not get the stable arc at all. It would
>buzz and hiss loudly and really jump around. The electrode would glow
>noticeably brighter and it would wear rapidly. There would be sooty deposits
>in the strike area. At its worst the arc would emerge as a jet of blush
>reddish plasma from the entire cup destroying the lens in the process. There
>would be copper deposits on the sides of the tip and in one spot on the side
>tungsten looked really shiny. I took the torch apart and reassembled it. The
>problem went away but is showing signs of coming back. Is this a classic
>symptom of something or a weird combination of novice errors?
>
>The machine is Lincoln Squarewave 175
>The torch is T-9
>average current is 80 - 125 A DCEN
>The electrode is 3/32 Th
>
>Here are the pictures of what the damaged tip and lens look like.
>http://www.viatrack.ca/Misc/TUNG_UN.jpg
>http://www.viatrack.ca/Misc/LENS_UN.jpg
>
>
>
>Regards,
>
>Boris Mohar
Sounds to me like you're getting discharge in places other than from
tungsten tip to workpiece. That suggests a deposit of metal in the
various parts of your torch, cup, lens, etc.
You might try gritblasting those parts where a discharge could occur
from tungsten to metal deposit to workpiece.
You may need a new torch.
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>My guess is its a gas flow problem- either you forgot, or the valve was
>sticky, or there was some teflon tape in the hose, or a kink, or
>something along those lines.