Common mistakes when soldering copper pipes include failing to clean and prep pipe ends thoroughly with sandpaper, applying too much or too little plumbing flux, overheating the fitting with the torch so the flux burns away, and attempting to solder a joint that still contains residual water. Even a tiny drop of standing water inside the pipe will convert to steam, prevent the metal from reaching soldering temperature, and ruin the joint, causing immediate leaks. Verification: Ensure pipes are completely dry and fluxed before applying heat.
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