sweating copper prep

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Leemonster, Feb 18, 2006.

  1. Leemonster

    Leemonster New Member

    Messages:
    14
    Hello all, I finished cleaning, fluxing, fitting several pipes and fittings but had to tend to some other chores before I could solder them. Is it OK to solder these joints after they have been sitting overnight or should I clean and flux again. Thanks
  2. Cass

    Cass Plumber

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    Solder them
  3. Gary Swart

    Gary Swart In the Trades

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    Yakima WA
    Clean 'em again. I read somewhere that something happens with the copper if it is allowed to set for a period of time before soldering. I never even bother to clean the fittings and pipe ends or apply flux until I actually am ready to solder the joint. If I can I'll do both ends of the fitting at once, but if that's not practical, I treat them individually. I normally use a round wire brush that fits inside the fitting and another doughnut-like brush that fits around outside of the pipe. Emery cloth works very well on pipe ends, but is harder to use inside fittings. I use a small brush for applying flux on the pipe ends as well as inside the fitting.
  4. Cass

    Cass Plumber

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    It takes more than 24 hrs. to affect the flux and copper. It should be fine. I have done some that had been fluxed more than 3 days.
    Last edited: Feb 18, 2006
  5. Gary Swart

    Gary Swart In the Trades

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    I yield to Cass's experience. I know I read something about this somewhere, but not remembering exactly what the time frame was, and since cleaning and fluxing take very little time or effort, I just took no chances. Thanks for setting us straight, Cass, but I think I'll continue with what I have gotten accustomed to doing. :)
  6. Cass

    Cass Plumber

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    I also yield to what you have become accustomed to. You have to feel that the job was done right.
  7. hj

    hj Moderator & Master Plumber Staff Member

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    joints

    It will also make a difference depending on exactly which flux you used. Some will create a patina, that does not clean itself when heated, while others will be reactivated by the heat.
  8. Leemonster

    Leemonster New Member

    Messages:
    14
    Well I took a chance and went ahead with the soldering and had no problems. I used Oatey #95 flux with Oatey safe flo solder. Your advice is much appreciated. Thanks.
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