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#2. Re: How to un-solder copper joints. heat the joint up till you see the solder is liquid then pull and twist the pipe from the fitting. When you re-install a new piece of pipe heat the fitting to re-soften the solder, flux pipe to be inserted and push it back in as you heat the fitting and re-apply a bead of solder.e: How to un-solder copper joints. You are going to have better luck with propper equipment and material. For under 1-1/2. I use a turbo-torch stk-9 with mapp gas.
1 Suspend your rusty part from the pipe or stick with wire, submerged, making sure it does not touch the steel basket lining the bucket. Do not use copper like I did. Use steel wire, the same as for the cage. Make sure the two poles ( positive and negative ) never touch.  Make sure your work area is well vented! Unplug your 12-volt battery charger. Set it to about 2 amps. Hook the positive (red) lead to the bucket basket and the negative (black) lead to the rusty part lead. Plug the charger in and look at the meter; it should be drawing about 2 amps.