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Thread: Anyone here experienced in silver soldering?

  1. #41
    Boolit Grand Master



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    Quote Originally Posted by Hannibal View Post
    Prest-O-Lite torch. Large tip. BenzOmatic silver bearing acid core flux solder. Solder worked perfectly in the past but it's been 10 years since I bought it.
    That is less than 1% silver. https://db1736767dbd5e7094bb-d61bbc5...c56171125c.pdf
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  2. #42
    Boolit Master
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    there are eutectic, or there used to be, solders available for joining steel and stainless steel. I still have a couple large spools of the stuff that will join stainless. it works great for putting stuff like commercial kitchen hoods and such together but not as strong a joint as mig, big or stick.

  3. #43
    Boolit Master Hannibal's Avatar
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    Quote Originally Posted by Rockindaddy View Post
    There is no such thing as acid core silver solder or silver braze. You must be using a lead/ tin base acid core solder that melts around 650* Silver braze requires an oxygen-acetylene torch and melts at 1500* The flux is white and looks like dry wall compound. Been silver brazing since I was a kid 60 years ago. Its easy! Silver braze solder wire is just shy of $95 per small roll. Only tiny parts can be silver brazed with a propane torch. Go see your local welding supply shop They will know what you are doing wrong.
    Can't argue. Just reading the label and I've not used silver solder before buying this product.

  4. #44
    Boolit Bub
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    It's either joint contamination or not enough flux.
    My guess is it's a flux issue.
    But I did wonder if your scotch-brite pad was contaminated with oil or something which in turn would contaminate your joint.

  5. #45
    Boolit Master Hannibal's Avatar
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    Quote Originally Posted by M-Tecs View Post
    Very well might be. I can't find any content listed on the spool and I can't find anything listed online regarding content.

  6. #46
    Boolit Master Hannibal's Avatar
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    New pad and I cleaned it with acetone before applying heat so I can't fathom how. I agree it sure acts like it though.

  7. #47
    Boolit Master Hannibal's Avatar
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    Quote Originally Posted by country gent View Post
    what is the physical size of the joint length and width in inches
    The base piece is 1 7/8" x 5". The part I'm attempting to attach is 1 7/8" x 7/8". Along one end of the base piece is where I'm attaching it. So the joint is essentially 7/8" x 1 7/8".

  8. #48
    Boolit Grand Master

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    being 1/4" mild steel and pins for alignment I think I would opt for a tig weld with pre heat of the material. A good brazed joint will work. silver solder would be way down on my list do to the amount of solder and cost.

    A lot of our silver soldering on bigger tools we would pre heat on a piece of carbon or aluminum in the furnace clamped together to temp then pull them out and touch the solder to them. You got a beautiful joint good penetration/flow and little warpage.

    On medium to big parts a plain propane or map gas torch is going to be wanting getting up to temps required.

    1/4" can easily be veed out and welded With the right filler rod when cleaned up the weld will disappear. A good tig weld will have almost no splatter and the pattern or grain will polish out quickly.

    I normally braze cast iron in bigger jobs, steels aluminums stainless tig or mig. I reserve silver solder for little jobs or attaching carbide cutters to shanks. soft solder is for electricals and plumbing.

  9. #49
    Boolit Grand Master



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    Quote Originally Posted by Hannibal View Post
    The base piece is 1 7/8" x 5". The part I'm attempting to attach is 1 7/8" x 7/8". Along one end of the base piece is where I'm attaching it. So the joint is essentially 7/8" x 1 7/8".
    Regardless of silver braze you are using you want .002" to .005" clearance for maximum strength and wicking. For larger areas like you have light prick punch marks work well or silver braze foil/sheet. Never used this one but this is an example of the product. You would cut a 7/8" x 1 7/8" piece and sandwich it in between the pieces with flux.

    https://www.amazon.com/Silver-Brazin...07S67TWKP?th=1

    https://www.canadametal.com/wp-conte...lver-alloy.pdf
    Last edited by M-Tecs; 01-13-2024 at 08:22 PM.
    2nd Amendment of the U.S. Constitution. - "A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."

    "Before you argue with someone, ask yourself, is that person even mentally mature enough to grasp the concept of different perspectives? Because if not, there’s absolutely no point."
    – Amber Veal

    "The Highest form of ignorance is when your reject something you don't know anything about".
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  10. #50
    Boolit Master Hannibal's Avatar
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    Quote Originally Posted by country gent View Post
    being 1/4" mild steel and pins for alignment I think I would opt for a tig weld with pre heat of the material. A good brazed joint will work. silver solder would be way down on my list do to the amount of solder and cost.

    A lot of our silver soldering on bigger tools we would pre heat on a piece of carbon or aluminum in the furnace clamped together to temp then pull them out and touch the solder to them. You got a beautiful joint good penetration/flow and little warpage.

    On medium to big parts a plain propane or map gas torch is going to be wanting getting up to temps required.

    1/4" can easily be veed out and welded With the right filler rod when cleaned up the weld will disappear. A good tig weld will have almost no splatter and the pattern or grain will polish out quickly.

    I normally braze cast iron in bigger jobs, steels aluminums stainless tig or mig. I reserve silver solder for little jobs or attaching carbide cutters to shanks. soft solder is for electricals and plumbing.
    Going to send you a PM and disclose more details.

  11. #51
    Boolit Grand Master

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    How about 2 or 3 flat head screws 1/4 20 drilled thru one and tapped into the other. with the pins that will be as strong or stronger than the solder joint. Easier too.
    clamp on the pins lay out the holes center punch drill a #7 hole separate open one side to letter f or g countersink and bolt together.

  12. #52
    Boolit Grand Master

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    Will be awaiting your PM

  13. #53
    Boolit Master elmacgyver0's Avatar
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    Soldering can be a bit of an art form.
    I used some of that soft silver bearing solder to solder two stainless steel mixing bowls together to form a large spherical still.
    I tried using a torch and the solder just balled up like you described.
    I finally got it to work using a heavy antique coper soldering iron, who would have thought?
    I did use a liquid flux and heated the iron with a torch, it does not take that much heat for the soft silver solder, it does take finesse.
    You have to use the iron to smear the solder on the part kind of like frosting a cake, once you get both parts wetted with solder you can put them together and heat them to get them to join.
    Of course, this won't work with the hard silver solder, that takes a lot of heat, like brass brazing.

  14. #54
    Boolit Master
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    I would not call that "silver bearing lead free solder" silver solder. I believe that acid core stuff is made for plumbing and maybe stained glass windows, rosin core would be for electrical wires/electronics. silver solder is used for specialized stuff for the most part. HVAC, hydraulics, gun sights, carbide and tungsten joints, ect

  15. #55
    Boolit Master Hannibal's Avatar
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    Quote Originally Posted by country gent View Post
    Will be awaiting your PM
    Forum says your inbox is full. Odd because I couldn't send anything yesterday because mine was supposedly too full. Forum issue perhaps.

  16. #56
    Boolit Master Hannibal's Avatar
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    Quote Originally Posted by farmbif View Post
    I would not call that "silver bearing lead free solder" silver solder. I believe that acid core stuff is made for plumbing and maybe stained glass windows, rosin core would be for electrical wires/electronics. silver solder is used for specialized stuff for the most part. HVAC, hydraulics, gun sights, carbide and tungsten joints, ect
    Very possible. I bought it several years ago and thought I had the right stuff. Beginning to look like that was my first mistake which has compounded with time.

  17. #57
    Boolit Grand Master

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    I should be opened up now. Did you receive my PM a little while ago?

  18. #58
    Boolit Master Hannibal's Avatar
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    Quote Originally Posted by country gent View Post
    I should be opened up now. Did you receive my PM a little while ago?
    No Sir. I'll try to PM you again.

  19. #59
    Boolit Grand Master

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    Ill see if I can find it and resend it.

  20. #60
    Boolit Master Hannibal's Avatar
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    Quote Originally Posted by country gent View Post
    Ill see if I can find it and resend it.
    Just messaged you. Looks like it worked this time.

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