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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. Turn off and make sure there is no water flowing inside any pipe before you attempt to solder a valve onto it. If you're installing a valve onto an existing supply line, turn off the water to that line.If the line doesn't yet have a dedicated valve, turn off the main water valve for the house.. Spread flux generously on the ends of the pipes and on the inlets of a brass valve with the brush that comes with the flux. If you're installing an inline valve rather than a brass faucet, you may have to cut a small section from one of the pipes so you can fit the pipes back together with the valve in between them.