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  1. #1
    Join Date
    Oct 2002
    Posts
    9

    To FLUX or not to FLUX

    I use only silv 45 on copper to steel joints, been talking to another tech who uses 45 and white flux. I don't like the idea of any thing getting inside of the refer system which I'm sure some of the flux does.
    Are there any standards on this practice, or is up to the individual.

  2. #2
    Join Date
    Oct 2001
    Posts
    6,945
    FLUX IT...your hitting the pipe with a 1500F flame clean and quik next joint
    "when in doubt...jump it out" http://www.youtube.com/watch?v=U1qEZHhJubY

  3. #3
    Join Date
    Oct 2002
    Posts
    9
    No worry about the flux contaminateing the system? . Ya thats the reason he says he uses it for the quicker process.

  4. #4
    Join Date
    Apr 2008
    Location
    Mesquite(Dallas), TX
    Posts
    44
    Always use flux - makes for a quicker-cleaner and solid joint. I've done it this way for years and never had a problem.

  5. #5
    Join Date
    Jun 2001
    Location
    Greeneville, Tennessee
    Posts
    344

    Flux

    I have used flux for this type brazing, as you mention, for over 25 years.

    No need to worry, except, clean the outside of the brazed connection as best as possible once completed.

    I usually clean with water then sand off or file off any excess flux. Otherwise, you will have corrosion set in over time. Plus a good visual to make sure you have capped the brazed joint solid! Telescopic mirror a must.

    Make sure you leak test!! After the repair you should evacuate, so make sure you are leak free or otherwise you will introduce moisture into the system!

    Depending on how you can isolate the system, you could always run nitrogen through the system while you braze which will prevent oxidation inside the piping. This is always a good practice, but rarely performed including myself! Evacuate the isolated portion of the system after nitrogen has been introduced into the system, to make sure all non condensible's are removed.
    Last edited by dgruber; 08-16-2008 at 08:44 PM. Reason: Added info

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