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Question:

Can a hole in copper pipe be spot soldered ?

Can a hole (the diameter of pencil lead) in copper pipe be spot soldered to stop the leak?

Answer:

Depending on pressure, you could do allot. J.B. Weld might even work. Replacing the section of pipe is best, the problem will resurface if you don't. That is the Zen of home repair, do it now or do it later; small problems will only become larger if left unchecked. Soldering is but a band-aide.
It can be done by watching the melting point of the solder so you don't get a lot inside the pipe. This is not the best remedy though. If the hole wasn't caused by something being punched into the pipe, it indicates that the pipe is very thin and more holes will soon be popping up. You could repair it with a piece of rubber and a small hose clamp.
Depending on pressure, you could do allot. J.B. Weld might even work. Replacing the section of pipe is best, the problem will resurface if you don't. That is the Zen of home repair, do it now or do it later; small problems will only become larger if left unchecked. Soldering is but a band-aide.
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I've dabbeled in a little work that involved copper plumbing and every hole I've ever delt with be it the size of a pin head is repaired by working a new piece with a coupler on each end into the place of the damaged length. solder alone shouldn't be trusted at any pressure that focused. With the new couplers the pressure and stresses would be spread out over a much greater area. Also take into account what caused that hole if the forces causing it punched a hole in the copper solder wont stand a chance.
It can be done by watching the melting point of the solder so you don't get a lot inside the pipe. This is not the best remedy though. If the hole wasn't caused by something being punched into the pipe, it indicates that the pipe is very thin and more holes will soon be popping up. You could repair it with a piece of rubber and a small hose clamp.
I've dabbeled in a little work that involved copper plumbing and every hole I've ever delt with be it the size of a pin head is repaired by working a new piece with a coupler on each end into the place of the damaged length. solder alone shouldn't be trusted at any pressure that focused. With the new couplers the pressure and stresses would be spread out over a much greater area. Also take into account what caused that hole if the forces causing it punched a hole in the copper solder wont stand a chance.

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