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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.
8. Carefully remove the aluminum wire (with copper on it) from the beaker. The beaker is HOT but the aluminum is not. Scrape all of the newly formed copper off the aluminum wire with a small metal spatula into your massed plastic cup.. Use a small piece of steel wool to shine a 16 - 18 cm piece of aluminum wire to remove any surface impurities. Do this on some paper towel (not on the lab table/counter, please!). Be careful of the wireâs sharp edges. The safest way to clean the wire is to brush it on a flat surface away from your body.