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Tractor Talk Discussion Forum

What is Silver Solder ???

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Wondering Again

06-02-2005 18:28:08




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I've had some silver soldering done for me and am wondering, what exactly is silver solder? Why is silver in there? How does it compare to regular solder, to brazing, gas welding, etc? What are the advantages of it (or disadvantages)?




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Joe Evans

06-03-2005 06:17:56




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 Re: What is Silver Solder ??? in reply to Wondering Again, 06-02-2005 18:28:08  
Yes, many different % content of silver in these solders.

A common alloy is Harris Stay-Silv 15, also called Sil-Fos and contains 15% silver. I sold in a flat wire configuration about a 1/16" thick x 3/16 wide and 12" long.

Silver has a great affinity for copper and is used for making very tough, hi-temp solder joints. Typical application would be on oxygen and hydrogen lines where K copper pipe and wrot fittings are spec'd.

In the event of a fire, you wouldn't want a common solder joint failing and further feeding a fire with an opened oxygen or hydrogen joint.

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RAB

06-02-2005 23:10:07




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 Re: What is Silver Solder ??? in reply to Wondering Again, 06-02-2005 18:28:08  
On top of what the rest say, there are several grades so that using controlled temperature, things can have other bits added at a lower temp without melting the earlier joints. useful in jewellery applications amongst others.
Regards, RAB



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Coloken

06-02-2005 19:15:40




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 Re: What is Silver Solder ??? in reply to Wondering Again, 06-02-2005 18:28:08  
Higher temperature that lead/tin. Much stronger, more like brazing. Used to in refrigerators where soft solder is not good enough.



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Davis In SC

06-02-2005 19:10:27




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 Re: What is Silver Solder ??? in reply to Wondering Again, 06-02-2005 18:28:08  
Yes there is silver in silver solder, that is why it is so expensive... It is available in different melting temps, depends on what the application is. A properly prepared & soldered joint is quite strong... A good example of silver soldering is on masonry drills & lathe bits, where the carbide is soldered to the steel... The main advantage is a strong bond, but done at a lower temp than brazing or welding. Also lets you join dissimilar materials.....

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