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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.
Desoldering tools and materials include the following: 1  Solder wick. 2  Heat guns, also called hot air guns. 3  Desoldering pump. 4  Removal alloys. 5  Removal fluxes. 6  Heated soldering tweezers. 7  Various picks and tweezers for tasks such as pulling at, holding, removing, and scraping components.esoldering braid, also known as desoldering wick or solder wick, is finely braided 18 to 42 AWG copper wire coated with rosin flux, usually supplied on a roll. The end of a length of braid is placed over the soldered connections of a component being removed.