metalresearcher
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Tungsten rod not pure ?
For using as an anode for an electric arc furnace I ordered two W rods of 200mm long x 5mm diameter.
https://www.ebay.com/itm/224180442907
I received them after a week and they indeed appeared like tungsten, felt rather heavy.
Then I checked the density and it appeared to 53g per rod which means 53g/((0.25cm)2*pi*20cm) which means 13.4 g/cm3, well below the real density of W
which is 19.3.
Or is it really 'cemented tungsten steel' which means a steel core with W wrapped around it which explains the low density ?
And is this really 99+ % W metal ?
https://www.ebay.com/itm/314087659398
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violet sin
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Get a tig welding rod pure W. 3/16" is almost 5mm but they not cheap. I see ~75$ US for 7pc pack?
Cemented Carbide vs Tungsten Steel
https://www.samaterials.com/content/cemented-carbide-vs-tung...
Generally speaking, tungsten steel is smelted by adding tungsten raw materials into molten steel by steelmaking process, and its tungsten content is
generally 15-25%
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Chemetix
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The wording 'Tungsten steel round bar rods' is a giveaway....Tungsten steel as in a steel alloy containing tungsten.
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Fulmen
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The designation isn't correct , but I think it's safe to assume it's 'K10 Cemented Tungsten Carbide':
https://carbide.ultra-met.com/item/iso-grades/iso-grade-clas...
Basically it's a high strength composite composed of 94% tungsten carbide in a 6% cobalt matrix. You need to look for welding electrodes.
You should also familiarize yourself with the available types:
https://www.thefabricator.com/thewelder/article/consumables/...
We're not banging rocks together here. We know how to put a man back together.
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metalresearcher
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| Quote: | | You need to look for welding electrodes. |
Something like this from Amazon ?
https://www.amazon.com/s?k=tungsten+electrode&crid=1QIKZ...
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violet sin
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Green for pure tungsten. I'm a fan of orange, 4% thoriated for my collection of radioactive oddities collection. There are different colors for a
quick reference to composition. In the TIG environment, some run better AC or DC and react to frequency diff. I'm a newbie to TIG, have the machine
but still looking for n argon bottle I can afford.
Here maybe try this
3/16" pure tungsten ~75$ US
https://www.amazon.com/Pure-Welding-Tungsten-Electrodes-Gree...
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Fulmen
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Yup, that's the right stuff.
We're not banging rocks together here. We know how to put a man back together.
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Mateo_swe
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The second ebay link in OPs post states its pure tungsten rod 99.99%
But they are only 100mm long and a 5mm diameter is 12.89 GBP or about 14,5 Euros.
Seems they have lots of different thickness, 2 to 15mm diameter.
The TIG tungsten rods i think is pure tungsten also but there is different variants so choose the pure tungsten one.
A 10Liter 100% Argon 200bar bottle in Europe is about 150 Euros on Ebay (one time use bottle).
You could buy a refillable bottle and then the refills are cheap but the refillable bottle is expensive.
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Admagistr
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Quote: Originally posted by Mateo_swe  | The second ebay link in OPs post states its pure tungsten rod 99.99%
But they are only 100mm long and a 5mm diameter is 12.89 GBP or about 14,5 Euros.
Seems they have lots of different thickness, 2 to 15mm diameter.
The TIG tungsten rods i think is pure tungsten also but there is different variants so choose the pure tungsten one.
A 10Liter 100% Argon 200bar bottle in Europe is about 150 Euros on Ebay (one time use bottle).
You could buy a refillable bottle and then the refills are cheap but the refillable bottle is expensive. |
It's the one marked in green! That's pure tungsten!
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Sulaiman
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I used tungsten rods like the ones in the second link for spark gap tesla coils,
the erosion was so negligible that I believe they were/are pure tungsten.
CAUTION : Hobby Chemist, not Professional or even Amateur
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Fery
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Just visit welding shop personally and tell them that you want pure tungsten electrodes. In my country they are 99,8% pure W (green electrodes). I
bought also the mentioned orange electrodes which contain 4% ThO2 - the e-shop even contacted me that they found few more orange electrodes, whether I
do not want to buy them too (because I bought all they had in their e-shop system), that nobody uses them today for welding due to toxicity so they
gave me a discount (wanted to get rid of them). Owning this form of Th is legal in my country.
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Texium
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Thread Moved
14-9-2023 at 11:44 |
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