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  1. #1
    Join Date
    Jul 2011
    Location
    Stuart, Florida
    Posts
    38

    Brazing sticks % of sliver

    Used 5% silver in school, see other levels out there. is there a recommend what should be using.

    thanks

  2. #2
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    2,127
    I always use Harris 15%
    ...

  3. #3
    Join Date
    Jul 2011
    Location
    Stuart, Florida
    Posts
    38
    Not asking about the percentage. what is the difference?

  4. #4
    Join Date
    Aug 2011
    Location
    Bangalore
    Posts
    21
    As per me, it depends on the material you want to braze. If you want to braze two dissimilar metals(e.g. copper to brass etc), then percentage of silver content should be high.

  5. #5
    Join Date
    Nov 2011
    Location
    St. Louis
    Posts
    3,341
    Higher the silver, easier it flows, less heat needed. Less heat the better.

    Boss is buying 6% as it's cheaper.

  6. #6
    Join Date
    Mar 2006
    Location
    Denver/Boulder
    Posts
    2,224
    Also, the higher the silver content the stronger the braze.

    15% silver for most tasks has been the standard looooong before I started in the trade.

    As jatinder.bhargav said, dissimilar metals call for more.
    What lies behind us and what lies before us are small matters compared to what lies within us.


    Two pressures, four temperatures = SUCCESS!


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  7. #7
    Join Date
    Apr 2011
    Location
    Coastal Maine
    Posts
    820
    As previously stated, it depends on what your sticking together. Normal everyday copper to copper and copper to brass I prefer 15%. But when you start talking about carbon steel to copper, then you need 45% or higher and probably flux coated. If you have something like stainless steel to copper you need to look at 56% and higher. There are charts out there from Harris and others detailing what each alloy is for.

    Good Luck.

  8. #8
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    I like 15% because it has better gap filling ability than the lower silver content alloys.
    If all of the joints are good and snug, the difference between 0% and 15% is barely noticeable, but if there is some slop in the joints, as is often the case when working with soft copper, or the stub outs on residential equipment, using 0% can be frustrating. 15% is king for copper to copper.

    For copper to carbon steel, I like Harris Safty Silv 45. It has a blue flux coating on it, so with carefully prepared fittings/tubing, no additional flux is needed, reducing the chance for getting flux in the system.
    For copper to stainless steel, or when I'm unsure of what kind of steel it is, I like Harris Safty Silv 56 It has a pink flux coating.

    I'm still working on a "favorite" for copper to aluminum, and aluminum to aluminum. I picked up a sample of something at the AHR expo that I'm going to try out though.
    If more government is the answer, then it's a really stupid question.

  9. #9
    Join Date
    Sep 2009
    Location
    Stumptown,USA
    Posts
    1,251
    www.silfos.com and www.harrisproductsgroup.com both have info on brazing. On Harris website click on expert advice and go to bottom of page and click on all videos.
    Challenge yourself, take the CM test --- Certificate Member since 2004 ---Join RSES ---the HVAC/R training authority ---www.rses.org

  10. #10
    Join Date
    Feb 2013
    Location
    Huntsville, AL
    Posts
    80
    I haven't ever heard anything bad about the 5% rods for plain copper to copper.Although I have found old connections that have cracked at the joint and leaking refrigerant.I know that 15% produces a higher tensile strength on connections,and has a thicker liquid state.Also as stated above it fills in gaps better than 5%.May be overkill but I have always used 15%.

  11. #11
    Join Date
    Jan 2008
    Location
    Texas
    Posts
    1,784
    I used to use 15% but with the cost of it now, i use 5%. Haven't had any problems yet and flows fine on copper to copper.

  12. #12
    Join Date
    May 2006
    Posts
    10
    15% for me also.

  13. #13
    Join Date
    Jan 2013
    Location
    Henry county,ky
    Posts
    81
    15% for me too. It's pretty standard in the trade. But yes the cost is up on it. Haven't used anything less. The gap filling ability is great though. Have soldered many copper to copper with it to make drains on water lines in hydronic heating. Especially to make bleeders for air traps

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