nitrogen at 275 F

[Gore]

I have a tire that is nitrogen filled at 145 psi. I have to weld a small plate on the rim. The temperature that is transfered to the nitrogen due to the welding process is 275 F. The nytrogen is exposed to that temperature max 15 min.
How will the nitrogen respond to that temperature?

 

[MintJulep]

PV = nRT

 

[Gore]

THE TIRE IS R15 AND THE PLATE I WANT TO WELD IS 4" X 2" X 0.125" THK, THEREFORE NOT ALL THE NITROGEN IS EXPOSED TO 275 F, ONLY A SMALL AMOUNT OF IT.

 

[IRstuff]

Why is it so important to keep the tire inflated during this operation?

The safety issue is not from nitrogen heating up, per se, but from the other accidental possibilities of rupturing the beadline or sidewall from the torch itself, or from the beadline breaking from the heat directly transmitted through the rim.

There's always an admonition about unplugging appliances before repairing them. I suggest that you deflate the tire to a safe pressure and then do the work. Nothing will ruin your day like an accidental slip of the torch causing an explosive rupture.

TTFN

 

[MintJulep]

Or the weld puddle melting all the way through, causing a jet of molten metal to spray back at you....

 

[Barry1961]

That, 145 psi, is a high pressure for a tire, bunch of stored energy, sort of like a bomb.

Nitrogen does not react at such a low temperature. Nitrogen is used in plasma cutting at temperatures over 2000F.

Barry1961

 

[swall]

A consulting engineering firm I do business with has been involved in at least one litigation case where someone was injured because the tire blew when a weld repair to the rim was attempted.Bad plan.