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Thread: Silver soldering?

  1. #1
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    Silver soldering?

    I spent a lot of time in jewelry-makign classes in high school, and am hoping to apply my knowledge to slightly more practical applications - specifically, silver soldering various things together. I am, however, at a bit of a loss as to how I might do this without spending an arm and a leg - MAPP gas isn't hot enough, my mini-size oxy-mapp torch can run through $8 worth of oxygen in no time (and doesn't fit the cylinders I bought at Home Depotfor some inexplicable reason), and anything bigger is simply too big and too expensive for someone on my budget. Does anyone know of an unusually hot-burning MAPP torch or some other solution to my problem? Perhaps a torch using compressed air instead of oxygen?

  2. #2
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    Odd... I've done silver soldering with a plain Mapp torch - no Oxygen. Of course, it only works on small items, and the parts must be clean and properly fluxed.

    Somewhere, (unused for years) I have a Micro Torch® and a set of regulators, but I haven't gotten new tanks for it. I used to use it for installing gun sights - in a previous career field...

    Oxy-Mapp or Oxy-propane both ought to work for silver soldering (actually silver brazing) or bronze/brass brazing. The cheapest way, if this isn't to become a regular use type thing, would be to rent a set of tanks from your local welding supplier.
    Jim D.
    Adapt, Improvise, Overcome!

  3. #3
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    I used to us a low temp silver solder, bought, at of all places, Sears. Used it on guns mostly. Cooled hard and very strong. I had a big supply and might even have a little somewhere. But, if you search for low temp silver solder I suspect someone still sells it. Then you can just use plain ole propane torch.
    BTW, I heard that MAPP is no longer made or sold and some other stuff is now on the market.
    I know whatcha mean about expensive for that oxy and (formerly) MAPP.
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

  4. #4
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    Mapp gas works just fine. I used to silver solder new diamond segments onto diamond core drilling bits and it worked just fine. i have a tube of silver solder hanging around somewhere. I'll look for it tomorrow. If I find it you can have it.
    Faith, Hope & Charity

  5. #5
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    Quote Originally Posted by Bob Gibson View Post
    Mapp gas works just fine. I used to silver solder new diamond segments onto diamond core drilling bits and it worked just fine. i have a tube of silver solder hanging around somewhere. I'll look for it tomorrow. If I find it you can have it.
    That would be dandy - all the local store sells in small quantity is the wire stuff, which is bloody useless. Of course, you can buy by the sheet, but that's rather a large lump of cash for what is, to be honest, more silver solder than I'll use in a long, long time.

    Can anyone recommend a particularly good MAPP torch for this sort of thing? MAPP is somewhat rare, but I can still find it at several local stores. In theory, all torches burn the same temperature...but, then again, in theory, there's no difference between a $200 Woodcraft chamfer bit and the one I bought for $2 on eBay.

    Incidentally, stay the heck away from Easy-Flo. It has cadmium in it, which is absurdly toxic. Regular "easy" solder, AFAIK, is just silver and nickel, both of which are about as nontoxic as metals can get.

  6. #6
    can the silver coins be use in silver solder ?

  7. #7
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    Joseph said, in part: "....all the local store sells in small quantity is the wire stuff, which is bloody useless."

    Why do you say that?
    I have used plenty of it just fine.
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

  8. #8
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    Quote Originally Posted by Frank Fusco View Post
    Joseph said, in part: "....all the local store sells in small quantity is the wire stuff, which is bloody useless."

    Why do you say that?
    I have used plenty of it just fine.
    The soldering technique they taught us in high school doesn't work so good with wire solder. We would cut tiny chips of solder and place them between the two surfaces to be joined, something that works nicely with sheets but not with heavy-gauge wire.

    Is there a good way to use wire that won't leave a bunch of excess around the solder joint?

    Edit: Someone's clearing out Goss GP-9 torches on eBay. They haven't got a hose, but it looks pretty nice regardless. Any thoughts?
    Last edited by Joseph Shaul; 05-04-2010 at 10:41 PM.

  9. #9
    there is two ways to apply solder to a joint/before the parts are assembly--coat one surface with a thin coat of solder/then assembly the parts and apply heat---can you buy silver solder paste ?---the silver solder can be hammered to made it thin

  10. #10
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    Quote Originally Posted by Joseph Shaul View Post
    The soldering technique they taught us in high school doesn't work so good with wire solder. We would cut tiny chips of solder and place them between the two surfaces to be joined, something that works nicely with sheets but not with heavy-gauge wire.

    Is there a good way to use wire that won't leave a bunch of excess around the solder joint?

    Edit: Someone's clearing out Goss GP-9 torches on eBay. They haven't got a hose, but it looks pretty nice regardless. Any thoughts?
    You mean all that goop around the joint isn't supposed to be there?
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

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