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Winkler, Manitoba Canada | rancherman - 4/14/2025 06:08
'Chemical reaction'?? Nope.
This is purely a physical reaction.
Temp increases on a gas in a confined area is proportionally related. It's called the Gay-Lussic law
Where initial pressure and temp of P1/T1= P2/T2
simply stated: double the temp *kelvin scale* doubles the pressure.
pulling a LONG bead on a rim is going to put a LOT of heat into that confined area.
I break the bead and block the side that's being welded strictly to protect the rubber as most cracks are right on the bead area. Minimally I'll take the core out and let the air out on the rest.
You are wrong on this one.
"Pyrolysis is a thermochemical decomposition of organic material which can occur at elevated temperatures in the absence of oxygen. This decomposition process only requires the presence of rubber and heat. When heat is applied to the tire or to tire components, hydrocarbon vapours are released inside the tire. As the vapours are released, the air pressure and temperature within the tire increase dramatically. These vapours are highly flammable. If the flammable vapour inside the tire makes contact with oxygen at a temperature in excess of 400 degrees Celsius, auto-ignition can occur, resulting in an explosion.
Once the decomposition process begins, it is irreversible. There is no visual indication that the decomposition process is taking place. Depending on the particular circumstances, an explosion may occur immediately, within minutes or several hours after the exposure to the heat source. In many instances, an explosion can cause the tire and/or wheel components to be thrown great distances, resulting in severe worker injuries and/or fatalities as well as significant property damage.
The following list contains some situations in which pyrolysis can occur:
welding
heating with a blow torch
overheated brakes
equipment contact with high voltage power lines
tire or equipment fires
lightning strike
driving long distances with underinflated tires"
Copied from https://www.ontario.ca/page/alert-tire-explosion-pyrolysis
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Why is welding on a mounted tire dangerous?
