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
- posted
15 years ago
replacement of CO2 in welding
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- posted
15 years ago
They gave me a bottle of nitrogen by mistake for my MIG. Nitrogen didn't work worth a damn.
Steve
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- posted
15 years ago
Nitrogen is a reactive gas and thus is entirely unsuitable for shielding gas.
Grant
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- posted
15 years ago
"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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- posted
15 years ago
Leo Lichtman:
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. Don´t 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