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Old 04-15-2019   #11
motionclone
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Default Re: cracked rim - no replacement available

Surprised nobody has mentioned it but the tire should be dismounted before welding on rim. Could be dangerous situation if tire is left on rim.
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Old 04-15-2019   #12
D2Cat

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Default Re: cracked rim - no replacement available

I don't see how stitch welding the donut plate with the tire on the rim would cause any problem when taking your time. What do you think will happen?
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Old 04-15-2019   #13
Dave_eng
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Default Re: cracked rim - no replacement available

Quote:
Originally Posted by D2Cat View Post
I don't see how stitch welding the donut plate with the tire on the rim would cause any problem when taking your time. What do you think will happen?
It is all about this irreversible fast tire decomposition called pyrolysis.

You do not know you have started it and then you cannot stop it. This degradation process can also be started in ways other than welding such as:

overheated brakes
equipment contact with high voltage power lines
tire or equipment fires
lightning strike
driving long distances with underinflated tires

In most North American jurisdictions it is illegal to weld a rim with the tire on it because people have been killed.

https://www.youtube.com/watch?v=HiLeji8bLOk

Dave

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 vapors are released inside the tire. As the vapors are released, the air pressure and temperature within the tire increase dramatically. These vapors are highly flammable. If the flammable vapor 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.
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Old 04-16-2019   #14
shootem604
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Default Re: cracked rim - no replacement available

Quote:
Originally Posted by Dave_eng View Post
It is all about this irreversible fast tire decomposition called pyrolysis.

You do not know you have started it and then you cannot stop it. This degradation process can also be started in ways other than welding such as:

overheated brakes
equipment contact with high voltage power lines
tire or equipment fires
lightning strike
driving long distances with underinflated tires

In most North American jurisdictions it is illegal to weld a rim with the tire on it because people have been killed.

https://www.youtube.com/watch?v=HiLeji8bLOk

Dave

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 vapors are released inside the tire. As the vapors are released, the air pressure and temperature within the tire increase dramatically. These vapors are highly flammable. If the flammable vapor 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.
I learned something new today.
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Old 04-16-2019   #15
L35
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Default Re: cracked rim - no replacement available

Can you just pull the valve stem to prevent buildup?
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Old 04-16-2019   #16
D2Cat

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Default Re: cracked rim - no replacement available

I thought we were discussing stitch welding a disc to the wheel for additional support.

Have you ever taken an old automobile body panel and cut it just to weld back together? Much amperage applied too long and you have a mess. However, you weld a spot, then let it cool, or even use a damp cloth to cool and go on.

Welding a tractor wheel with much higher amperage, but going slow and letting it cool....there is no way you are going to get it 400 deg at the tire. Or maybe the tires that were on the rims I welded on were prehistoric rubber and not affected, but they were 16.9x38 tires.
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Old 04-16-2019   #17
SidecarFlip

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Default Re: cracked rim - no replacement available

Quote:
Originally Posted by D2Cat View Post
I thought we were discussing stitch welding a disc to the wheel for additional support.

Have you ever taken an old automobile body panel and cut it just to weld back together? Much amperage applied too long and you have a mess. However, you weld a spot, then let it cool, or even use a damp cloth to cool and go on.

Welding a tractor wheel with much higher amperage, but going slow and letting it cool....there is no way you are going to get it 400 deg at the tire. Or maybe the tires that were on the rims I welded on were prehistoric rubber and not affected, but they were 16.9x38 tires.
Glossed over it. Don't apply anyway. Not tossing the rim and tire in a bonfire, just doing some welding on the spider.

People today take something simple and complicate it. For what reason, I have no idea except maybe to inflate their ego's.

Duh.
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Old 04-16-2019   #18
SidecarFlip

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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?

An imaginary issue. If in doubt take the tire valve core out. Much simpler than pulling valve stem.

Duh again.
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Old 04-16-2019   #19
SidecarFlip

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Default Re: cracked rim - no replacement available

Quote:
Originally Posted by shootem604 View Post
I learned something new today.
I didn't 'learn' anything other than some technical jargon that is DNA for me.
3rd Duh.
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Old 04-16-2019   #20
motionclone
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Default Re: cracked rim - no replacement available

lol at sidecarflip

Last edited by North Idaho Wolfman; 04-16-2019 at 09:58 AM. Reason: Must play nice
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