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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 Cut the copper â this is best on copper at least .015â³ thick. 2  if you are planning on having it water jet cut later, add at least 1.5â³ to your sizes. 3  Sand the front with a 3M coarse grinder pads. 4  This will hide the scratches that copper inevitably gets and create a nice pattern in the metal. When you have finished, wait 2 minutes for the copper to cool a bit. 2  Turn off the torch and take the copper over to the washing area. 3  Put it upside down on something non-scratchy â wood, silicone paper or grass. 4  Not foam â it might melt. 5  The copper red patina is soft at this point.