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Silver soldering, I still don't get it.

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Stub Mandrel16/07/2013 21:06:03
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Hi Bill,

Because copper-phosphorus brazing alloy is bad news for boilers.

Look at CuP alloy's site, or Johnson Matthey's - they have loads of good advice and will point you at lower-silver content hard solders. In the UK for general purpose we used to use easy-flo but it got phased out because of its cadmium content and we now use slightly more expensive and slightly higher melting point alloys - silver-flo.

Neil

Bill Brehm17/07/2013 15:30:16
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I had to read a bit about boilers, and the problems caused by copper-phosohorus. I can see why you might not even want it anywhere in your shop. For my use, which is a static model, would it be a satisfactory alternative to Silver solder? I guess I'm asking the question: other than safety, why silver?

I need to do the second frame rail today, and considering how well putting the thin foils of solder between the mating surfaces worked, I'm thinking of just tinning one, or both piece first. I'm hoping there will not be a need for any additional solder.

Bill

JasonB17/07/2013 16:17:47
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I would avoid tinning one or both sides. Its fine to use with the low temperature"soft solders" but when you reheat silver solder the second time it needs more heat to get back to the liquid state.

J

Bill Brehm17/07/2013 21:59:51
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I just put on the thin foil like yesterday, no tinning. This one turned out much better.

Thanks

Bill

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