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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.
There are three main steps to repairing copper gutters that have been caulked: 1  Remove the caulk at the end caps, outlets, and miters. 2  Using an angle grinder fitted with a flap disk, start to clean off any remaining caulk and remove all patina from the areas being soldered. 3  Properly flux and solder the joints.