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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.
Place the copper pennies into the bowl. Allow the pennies to sit in the solution for 15 minutes. Empty the contents of the bowl (the liquid and copper pennies) into a strainer in your sink. Hold the strainer that contains the pennies under cold, running water for one minute.