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Science Forum Index » Engineering - Joining (Welding) Forum » replacement of CO2 in welding...
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 Posted: Wed Jul 30, 2008 8:24 am |
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Guest
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is nitrogen a good solution to replace CO2 where this gas is needed in
all welding cases?
Thanks for your comments and experience reports.
O. Marques |
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| SteveB... |
| Posted: Wed Jul 30, 2008 3:55 pm |
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<alvaro_marques2000 at (no spam) yahoo.com> wrote in message
news:4db930ef-93db-4642-af8d-7d10dec71177 at (no spam) x41g2000hsb.googlegroups.com...
Quote: is nitrogen a good solution to replace CO2 where this gas is needed in
all welding cases?
Thanks for your comments and experience reports.
O. Marques
They gave me a bottle of nitrogen by mistake for my MIG. Nitrogen didn't
work worth a damn.
Steve |
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| Grant Erwin... |
| Posted: Wed Jul 30, 2008 6:27 pm |
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alvaro_marques2000 at (no spam) yahoo.com wrote:
Quote: is nitrogen a good solution to replace CO2 where this gas is needed in
all welding cases?
Thanks for your comments and experience reports.
O. Marques
Nitrogen is a reactive gas and thus is entirely unsuitable for shielding gas.
Grant |
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| Leo Lichtman... |
| Posted: Wed Jul 30, 2008 7:08 pm |
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"Grant Erwin" wrote: Nitrogen is a reactive gas and thus is entirely
unsuitable for shielding gas.
^^^^^^^^^^^^^^^^^^^
I'm pretty sure I remember this right. At the bronze foundry I visit
frequently, they use nitrogen for welding castings together. At the
temperature of an arc, even CO2 becomes disassociated. |
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| eduart wolf... |
| Posted: Fri Aug 01, 2008 8:46 am |
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Leo Lichtman:
Quote: "Grant Erwin" wrote: Nitrogen is a reactive gas and thus is entirely
unsuitable for shielding gas.
^^^^^^^^^^^^^^^^^^^
I'm pretty sure I remember this right. At the bronze foundry I visit
frequently, they use nitrogen for welding castings together. At the
temperature of an arc, even CO2 becomes disassociated.
hi
Nitrogen is used in welding for shielding first layers weld from other
side(would someone translate that into english please?), Thats serious
industrie, in the smaller workshops you wont see that.
Are you sure it was Nitrogen, or just a green cylinder with an capital
"N" in white? That would be the DIN EN 1089-3 new colour-code for Inert
Gas , the N meaning "new colour code" until 2006 necessary to show its
not Nitrogen (old colour of course green).
Nitrogen reacts in an arc with oxygen and you get NOX- all serious
poisons.
CO2 is used as active gas in MAG because it dissociates and in cooling
reacts again giving off some energie away from the arc, so you heat up a
slightly bigger area. Also some C goes into the weld, I heard. Donīt
know about the left over O2/2O ,though.
I wonder if that explains, or do they use some exotic process I dont
find at "Air Liquide" homepage...
eduart |
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