Nitrogen Argon bottle mixup!

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Hi everyone! I just joined this forum and am looking for a little insight on a problem I'm having. I'm currently restoring a 1976 Jaguar Coupe, which has included new floorboards, rocker panels, fenders, and lots of other misc rust repair.    My shielding gas ran out yesterday with 95% of the welding done, I disconnected the regulator and noticed something. The label indicates 75% Nitrogen, 25% argon      I reviewed my receipt and it looks like they charged me for 75% argon, 25% Co2, so they clearly loaded the wrong bottle. Unfortunately, my wife picked up the bottle and didn't know what to check for.   So, does anybody know what problems I will face from using a mostly nitrogen shielding gas? Clearly the actual welding was a PITA, but it's all done now. I'm worried about the strength and long term integrity of the welds. I know the point of shielding gas is to shield the weld from the atmosphere (which contains mostly nitrogen) until it cools. Most of the work done was replacing or strengthening structural points of the car, will it still be safe? I'm trying to get a handle on all this before I go and tear Airgas a new one tomorrow , any insight will be greatly appreciated!Thanks,Irving
Reply:Pictures of the welds in question would be assistive.
Reply:Nitrogen is often used as an inert gas, like Argon, because of its non-reactive nature with many materials. It is widely used in the electronics and metals industries because of its inert properties. So, I think you're okay, next time shoot for the Argon/C02 mix if you prefer.John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:There are some potential problems with nitrogen on many materials. Among other things, excessive porosity and embritlement are possible. Without examining the welds and probably doing some destructive testing, it is ompossable to say if they are ok. They may be, they may not be.
Reply:destructive testing is always fun DewayneDixieland WeldingMM350PLincoln 100Some torchesOther misc. tools
Reply:As a side note... I've tried 100% nitrogen... didn't weld worth a hoot.  Was a porous weld.. but then again, could have been operator error