Sweating copper pipes

[Jim]

I am sweating copper pipes and have 1 joint that continues to have a tiny bead of water when I turn the water back on. I have reheated and resweated but to no avail. Any tips?

[Russell]

Sometimes the small ones seal themselves after a day or so.

[LJ in TX]

may have to break down and take the joint apart so you can resand the mating surfaces ,,,to clean them well. put a little solder paste on it so it will take solder better. then resweat the joint. LJ

[RON ORRIS]

IM TRYING TO SWEAT COPPER PIPES TOGETHER FOR A WATER LINE,BUT I CANT GET THE SOLDER TO STICK.I USED SANDPAPER TO CLEAN THE PIPES AND ALSO USED FLUX.BUT THE SOLDER JUST RUNS OFF.

[Dave]

How do i sweap pipes under a house, where the pipe will be in the horizontal position, will the solder stick while doing in from under the pipe??

[Author]

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