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Post by stoney43 on Jun 28, 2007 8:01:15 GMT
hello all
has anybody any experiance of brazing up copper boilers with the taymar 3480 copper to copper rods.
i have used these to great success on copper pipes to 300 psi. they are self fluxing and easy to use.
dave.
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Post by GWRdriver on Jun 28, 2007 11:47:28 GMT
Dave,
If this material is what is known as "phos-copper" in the US it should not be used for boiler building.
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Post by chris vine on Jun 28, 2007 13:57:10 GMT
Hi Dave,
If they contain phosphorus, they are not suitable for boiler work because the joints will be attached by acids in the fire, smoke etc..
If in doubt use proper silver solder as this has stood the test of time!!
Chris.
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Post by stantheman on Jun 28, 2007 15:46:34 GMT
Really have to urge extreme caution on this one. many years ago, before even I had gained the wealth of knowledge I hope I have now, I spent a great deal of time and effort in producing a boiler for my 'Pansy'. Without any thought I had used a rod which must have been very similar to these, one in fact used in our factory for refrigeration coil manufacture. Our boiler tester, without as much as a second glance condemmed the boiler because he was able to see the joints I had completed, and the colour they had come up with alongside the copper. I have to agree with Chris on this one, stick with what is already proven by many years of use and longevity. Phosphorous, not a nice word in any language!
Stan.
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Post by GWRdriver on Jun 28, 2007 17:43:05 GMT
If they contain phosphorus, . . . the joints will be attached by acids in the fire, smoke etc.. - Chris A "sulphurous" atmosphere is enough to do it. In addition, phos-coppers are subject to stress cracking and age embrittlement in boiler-like conditions, which like dezincification in brass happens on a molecular level and randomly and can't be seen until the leaks appear. |
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Post by stoney43 on Jun 29, 2007 7:52:32 GMT
thanks for the advise and info folks will keep these rods away from boiler work.
dave
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Post by Shawki Shlemon on Jun 29, 2007 10:28:55 GMT
Hi Dave
I waited to see all the replies before I say anything. To build a boiler you will pay for copper ,bronze for bushes , tubes, stays and gas not to mention time . My advice as a boiler inspector is to adhere to boiler code in your country and build it under their supervision ( inspections as required )and you will have a boiler that meets the requirements of the clubs and will worth something , unlike a boiler without any certification that is worth only the scrap value weather it works or not .
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Post by stoney43 on Jul 1, 2007 8:01:19 GMT
thanks again to you all for the good advise and resons for not useing these rods.
and as you say shawki to do all that work just to fail at the last ditch.
much nashing of teeth and tearing of hair not to mention the delay in running the engine/loco whilst one starts again.
dave.
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