brazing
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Thread: brazing

  1. #1
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    602

    brazing

    i used to use 15% silver brazing rod, i started with this company they supply us with 5% rod. for some reason the other day i was sweating 1-5/8" copper line for some reason when the joint starts to cool i get these fine little pin hole in the joint. even if i load it up, but i think it even happened on a 7/8" copper pipe.
    im trying to figure out why. is it because im over heating and causing it to burnm the solder rod material and break down??? but i dont think so because the pipe wasnt red hot if so then ill agree with over heating,, any input?

  2. #2
    Join Date
    May 2004
    Location
    Salt Lake City/Tooele
    Posts
    2,410
    Anything less than 15%, we use a flux, like Easy Flo to help move the material around. The more phosphorus and less silver, the higher probability of liquation will take place, and this is probably what you are seeing. We rarely use anything less than 15%, especially on larger diameter piping. Could simply be that the brazing material is thinning out so much at the joint that the nitrogen, I would hope you are using, is blowing out your joint?

    Tell your company that they may think they are saving a few bucks by dropping to 5%, but are going to loose the savings in labor and probable leaks in the long run.

  3. #3
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,234
    Have you tried turning down the heat a little?

  4. #4
    Join Date
    Sep 2009
    Location
    barrie,ontario
    Posts
    61
    i agree with the "turn down the heat" idea.we also use 5% at work and it is nasty to use.make sure your flame is nice and even,not oxidizing and jumpy.clean the copper well with sanding cloth.

  5. #5
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,234
    I dont like to use anything less than 15%

  6. #6
    Join Date
    Oct 2010
    Location
    Anderson, South Carolina, United States
    Posts
    6,207
    I've recently started buying 6% bc its so much cheaper than 15%. I use 15 on >7/8 but havnt had any problems with it yet, it does liquefy a lot easier and I probly use more per joint bc its so watery but havnt had any more leaks than usual

  7. #7
    Join Date
    Feb 2005
    Location
    Tampa Florida
    Posts
    759
    You can buy 15% on Ebay cheap. I just bought some Harris for $68 per lb shipped.

  8. #8
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    602
    i use flux on all my joints. plus it helps out a bunch. i use nitro when brazing especially on larger pipe that requires more heat and more flaking. i guess i have to get used to the 5% maybe i was spoiled with 15%
    i dont want to tell the boss anything because im the new guy ima stay quiet for a while.

  9. #9
    Join Date
    Apr 2010
    Location
    So Cal
    Posts
    69
    We're all shootin in the dark here because its difficult (for me anyway) to give you advise without having actually seen you braze. What re your torch settings? What size tip are you using? what size pipe are you brazing? I would advise you to seek the advise of another tech at your company whom you know brazes well, and ask them to watch you braze a joint and critique you.

  10. #10
    Join Date
    Jul 2011
    Posts
    20
    Quote Originally Posted by socotech View Post
    I dont like to use anything less than 15%
    X2

  11. #11
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,314
    Quote Originally Posted by anthonyac1 View Post
    i use flux on all my joints. plus it helps out a bunch. i use nitro when brazing especially on larger pipe that requires more heat and more flaking. i guess i have to get used to the 5% maybe i was spoiled with 15%
    i dont want to tell the boss anything because im the new guy ima stay quiet for a while.
    Try turning the nitro down.....

    If you're getting pinholes, it might be too much pressure.

  12. #12
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Practice practice practice. It's no different then when you started out on 15%. Just gotta figure it out and do it. We can tell you and someone can show you, good pointers here already, but in the end you just gotta do it. In 6 months it will be what you are used to and you'll be fine. Good luck.

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