#1
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Silver over copper?
Hi all,
I've got a short question. Is it possible to braze silver over a spot that was brazed with copper? The material that was brazed on is cast iron. Cheers Richard.
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Richard |
#2
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hmmm...if you just look at the melting temperatures, sure. copper is at 1984F and silver is 1763F..so you should have a comfortable range to work.
but, I think you have to be careful about the flux burning off before the silver melts!
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Lee. If it itches,......you just got to scratch it! |
#3
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Silver braze on Copper
I silver braze copper wire all the time. Code for high pressure copper air lines requires brazing, not solder. Lots of alloys to choose from. Get the right stuff.
http://www.fusion-inc.com/brazing/silver-brazing/
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Bill Funk |
#4
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Quote:
Brazing alloy for cast iron is a specific type of material - because of the graphite in the iron. You are seeing the copper portion of the braze, unless some adventurous person was using copper wire to repair the iron ....? If you can get the silver to flow onto the copper it will hold - but will it hold the iron together? Silver brazes of over 50% have the highest strengths, more than copper has, and bond very well to the copper, but I don't know the nature of the strength your repair requires.
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#5
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Hi Lee and Bill, thanks for the info. So mixing copper and silver will not be a problem.
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Richard |
#6
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Quote:
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Richard |
#7
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Quote:
(cyl head temp)
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#8
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Kent, I don't know. It's a vintage bike(GnomeRhone) from, I think, the thirties. The engine is a 4-stroke of the type, I don't know the correct word, that has the valves on the side of the cylinder so the hot exhaust gasses don't flow through the head and the valves don't give of the heat to the seats and of course the bike runs with low revs so I think the temperature of the head isn't that high as one who has the valves in the head.
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Richard |
#9
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Quote:
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#10
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I will give it a try
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Richard |
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