Removing JB Weld?

"UltraJohn" wrote in message
ink.net...
My only experience is with motorcycle tanks and filling with water really
sucks the heat out making it hard to weld to!
John

Same here. When I weld bike tanks I pump compressed air through the petcock
hole and work with the gas cap off and the hole pointed in a safe direction.
With a constant air flow fumes can't build up and the worst you're going to
get is a flash out where the air is escaping. I've done this dozens of
times with only a couple flashes like I was expecting not that it doesn't
startle me when it happens.

I don't know how big your tank is but if you can freeze it (-0 F.) then you
should be able to get the J.B. Weld to break out easily.

Tony

Anthony wrote:

"UltraJohn" wrote in message
ink.net...
My only experience is with motorcycle tanks and filling with water really
sucks the heat out making it hard to weld to!
John

Same here. When I weld bike tanks I pump compressed air through the petcock
hole and work with the gas cap off and the hole pointed in a safe direction.
With a constant air flow fumes can't build up and the worst you're going to
get is a flash out where the air is escaping. I've done this dozens of
times with only a couple flashes like I was expecting not that it doesn't
startle me when it happens.

I don't know how big your tank is but if you can freeze it (-0 F.) then you
should be able to get the J.B. Weld to break out easily.

Tony

An interesting idea.
My fridge won't do that low.
Maybe a box full of dry ice?

"Richard Lamb" wrote in message
...
Anthony wrote:

I don't know how big your tank is but if you can freeze it (-0 F.) then
you
should be able to get the J.B. Weld to break out easily.


An interesting idea.
My fridge won't do that low.
Maybe a box full of dry ice?

Or a really big CO2 cartridge. An upside down can of air like used for
dusting out computers held upside down will squirt liquid CO2 at around -100
F. If you try this wear a very thick and well padded glove.

Tony

Anthony wrote:

"Richard Lamb" wrote in message
...
Anthony wrote:

I don't know how big your tank is but if you can freeze it (-0 F.) then
you
should be able to get the J.B. Weld to break out easily.


An interesting idea.
My fridge won't do that low.
Maybe a box full of dry ice?

Or a really big CO2 cartridge. An upside down can of air like used for
dusting out computers held upside down will squirt liquid CO2 at around -100
F. If you try this wear a very thick and well padded glove.

Tony


I've heard this old saw so often even I was beginning to believe it.
While it is based on fact, it's not seriously practical.

When released (in)correctly, it is true that a CO2 extinguisher will
make a pile of dry ice. But it's a very small pile compared to the
amount of CO2 gas released. It would have to be a Very Very Big (TM)
can in order to chill a that big of a slug of steel to below 0.

Simple thermodynamics, dudes.


Richard (woolly coat and all) Lamb

Or a really big CO2 cartridge. An upside down can of air like used for
dusting out computers held upside down will squirt liquid CO2 at around -100
F. If you try this wear a very thick and well padded glove.

Tony

Liquid CO2? Are you sure that those computer dusting cartridges arent
using some sort of flourocarbons?





I've heard this old saw so often even I was beginning to believe it.
While it is based on fact, it's not seriously practical.

When released (in)correctly, it is true that a CO2 extinguisher will
make a pile of dry ice. But it's a very small pile compared to the
amount of CO2 gas released. It would have to be a Very Very Big (TM)
can in order to chill a that big of a slug of steel to below 0.


Discharging a CO2 extinguisher does not generate dry ice. The
expansional cooling of the compressed gas causes moisture in the air to
condense and freeze. The ice generated is the typical wet variety. Check
your sources.


Simple thermodynamics, dudes.

Sounds oversimplified.



Richard (woolly coat and all) Lamb

Dave

"Dave S" wrote in message
nk.net...


Or a really big CO2 cartridge. An upside down can of air like used for
dusting out computers held upside down will squirt liquid CO2 at
around -100
F. If you try this wear a very thick and well padded glove.

Tony

Liquid CO2? Are you sure that those computer dusting cartridges arent
using some sort of flourocarbons?

Yep, chlorofluorocarbons are banned.

Tony

Liquid CO2? Are you sure that those computer dusting cartridges arent
using some sort of flourocarbons?

Yep, chlorofluorocarbons are banned.

It isn't CO2, (or pressurised nitrogen). It's hydrocarbon. Read one of those
cans, there will be a fire warning.

"Anthony" wrote in message
...

"Dave S" wrote in message
nk.net...


Or a really big CO2 cartridge. An upside down can of air like used
for
dusting out computers held upside down will squirt liquid CO2 at
around -100
F. If you try this wear a very thick and well padded glove.

Tony

Liquid CO2? Are you sure that those computer dusting cartridges arent
using some sort of flourocarbons?

Yep, chlorofluorocarbons are banned.

Tony
You can still buy Halon fire extinguishers. The manufacture of the halogen
compounds is now banned but existing stores may still be sold.