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Old 3 Days Ago   #21
BigG
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Join Date: Sep 2018
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Default Re: cracked rim - no replacement available

I can not believe the smart axx remarks made about this welding job. The video shows what could happen if the job is not done correctly and you sound off as if it can not happen.

You are being just like the fool who will not chain down the load on his truck because he is only going a few miles down the road.

Safety is something that needs to be done on every part of every job. Taking a short cut, such as not dismounting the tire, is a lot easier but when the tire does blow up you will wish you had removed it.
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Old 3 Days Ago   #22
motionclone
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Default Re: cracked rim - no replacement available

Quote:
Originally Posted by BigG View Post
I can not believe the smart axx remarks made about this welding job. The video shows what could happen if the job is not done correctly and you sound off as if it can not happen.

You are being just like the fool who will not chain down the load on his truck because he is only going a few miles down the road.

Safety is something that needs to be done on every part of every job. Taking a short cut, such as not dismounting the tire, is a lot easier but when the tire does blow up you will wish you had removed it.
I think that sidecar guy should weld a rim and livestream it to show us dummies how its done.
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Old 3 Days Ago   #23
Dave_eng
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Default Re: cracked rim - no replacement available

Quote:
Originally Posted by L35 View Post
Can you just pull the valve stem to prevent buildup?
Don't forget your tire is destroying itself to uselessness, so even if the valve stem could vent the gases produced, the tire is done anyway.

Dave
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Old 3 Days Ago   #24
JeffL
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Default Re: cracked rim - no replacement available

Did a little research and at first found lots of info about pyrolysis process for the conversion of biomass and waste into fuels and char. All of the processes required almost no oxygen with high pressures and temps, 430C=806F, for conversion. I was ready to call BS to the tire blow-up theory as oxygen is present and conditions were only reached at the end when it blew up. Then I found info on house fires due to pyrolysis. I then realized pyrolysis is the process occurring between the carbon based fuel and the flame. It is the conversion process and oxygen is not present at the point of conversion. The gasses and oils given off can flash when it reaches oxygen. It is the process occurring when a combustable too close to the fire box suddenly flashes over. Pyrolysis needs heat to start but once going it is creating heat that can become self sustaining and even runaway in some conditions. High temps and pressures are for efficiency in commercial conversion and not required to start pyrolysis.
My thoughts: if you weld on the outer rim with the tire bead on the other side, you have a good chance of starting this process.
I suspect pyrolysis is the process used to make charcoal.
IF I have this all wrong please comment. Jeff
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Old 2 Days Ago   #25
Dave_eng
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Default Re: cracked rim - no replacement available

From Wikipedia:

Pyrolysis is most commonly used in the treatment of organic materials. It is one of the processes involved in charring wood.

In many settings, some amounts of oxygen, water, or other substances may be present, so that combustion, hydrolysis, or other chemical processes may occur besides pyrolysis proper. Sometimes those chemical are added intentionally, as in the burning of firewood, in the traditional manufacture of charcoal

You were correct re charcoal, not a perfect pyrolysis process but close enough....

Dave
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Old 1 Day Ago   #26
RCW

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Default Re: cracked rim - no replacement available

I honestly had no idea this stuff could happen. I learned something new, as I often do here on many topics.

One of the many reasons OTT is such a great Forum.

Whether or not a stitch of the hub could make it happen matters not to me...

I hang around a tire/ auto repair shop some Saturday mornings when I'm avoiding home chores. Never heard it there.

This old redneck idiot has/can/could/will do stupid stuff occasionally... Just ask my wife!

The fact it could happen is forewarned, thus forearmed...again - I had no clue.

Last edited by RCW; 1 Day Ago at 04:53 PM.
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