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Thread: Silver solder flux?

  1. #1
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    Default Silver solder flux?

    What is the best flux, and where to get it ?Bob.

  2. #2
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    I've used this, but only at brazing temperatures. I expect it should also work at lower soldering temps.

    https://www.amazon.com/Harris-SSWF1-...=fsclp_pl_dp_1
    Work hard play hard

  3. #3
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    Quote Originally Posted by 3 Phase Lightbulb View Post
    I've used this, but only at brazing temperatures. I expect it should also work at lower soldering temps.

    https://www.amazon.com/Harris-SSWF1-...=fsclp_pl_dp_1
    Does not work for soldering temps. Silver soldering is commonly confused with silver brazing so which one OP is intrested?

    Best flux for low temp silver solder depends on material and application. Electronics? Copper? Steel? Stainless steel?
    Last edited by MattiJ; 01-03-2019 at 04:13 PM.

  4. #4
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    imo silver solder does mean hard solder or silver brazing....i.e. the solder is 50% + silver. The low temp stuff is silver bearing solder, like 5% solder, but agree there is sometimes confusion so best to be specific.

    For SS/silver brazing I've been using Handy Flux, it works well. the Stay Silv mentioned also is good. Some will argue there's special goodness in these, others that plain old Borax is just is good.
    .

  5. #5
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    Quote Originally Posted by Mcgyver View Post
    imo silver solder does mean hard solder or silver brazing....i.e. the solder is 50% + silver. The low temp stuff is silver bearing solder, like 5% solder, but agree there is sometimes confusion so best to be specific.

    .
    Melting temperature of the filler alloy above 840F/450C but below the melting point of the metals joined is considered to be brazing.

    There are many brazing alloys with silver content as low as 5%, and melting points well above 840F, and perhaps not everyone would could call all these silver brazing alloys. They are brazes, not solders.

    But I think everyone would accept that Easy-Flo 25, for example, with 25% silver content, is a silver brazing alloy.
    Last edited by cameron; 01-03-2019 at 05:38 PM.

  6. #6
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    I use the black flux for silver brazing I was told it handles higher heat better than white.
    https://www.amazon.com/Harris-SSBF1-...6552039&sr=1-3

  7. #7
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    My luck with using hard solder / silver braze was awful using borax as a flux. I just couldn’t get any good bonding, even though the flow looked good.

    It’s been very easy and have had no failed joints once I bought this:

    https://www.mcmaster.com/7693a1
    Tom

    Be careful what you wish for, you might just get it!

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    And this side of pond I use Johnson Matthey easy-flo along with 55% silver braze

    https://matthey.com/products-and-ser...y-flo-products

    general purpose one has been working fine for me even with stainless and tungsten carbide even tough stanless has its own speciality flux.

  9. #9
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    Sorry, didn't mean to cause confusion, I thought that silver solder was by definition a high temp operation. I am replacing a carbide tip on a height gage scriber and thought that was my only option. Bob.

  10. #10
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    Quote Originally Posted by Bob Fisher View Post
    Sorry, didn't mean to cause confusion, I thought that silver solder was by definition a high temp operation. I am replacing a carbide tip on a height gage scriber and thought that was my only option. Bob.
    Harris black flux should do it.

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