Posted 23 March 2013 - 11:09 AM
Posted 23 March 2013 - 03:37 PM
If the joints are soft soldered I would suggest a few rivets as extra safety. Soft solder contains lead so it is not a good choice either.
Rivet heads on the inside of a still will retain moisture when the still is not being used. Copper compounds form in this moisture and you can get quite a buildup of blue/green that can't be good if it gets into the next batch.
A general suggestion for those who have a still that is not being used, open it up and dry it out. I have seen idle, wet stills, mine included, that start dripping blue liquid from the condenser (probably copper sulphate)
Posted 25 March 2013 - 12:49 PM
Posted 25 March 2013 - 03:45 PM
Posted 25 March 2013 - 07:38 PM
Posted 26 March 2013 - 06:44 PM
Posted 27 March 2013 - 02:23 PM
Here is what HVAC uses, 15% Silver...: $85 for 1lb... http://www.amazon.co...y/dp/B008AE4NBU
This is for copper to copper, brazing steel or other things you can use the other rods... but we are talking copper to copper, just like HVAC.
Firstly a question, what does HVAC mean?
Also, I assume the above rods are what we call "silver solder". I have mentioned this before, a stillmaker who gave me advice said that silver solder will eventually get holes in it when used in a still.
Does anyone know if this is correct?
Posted 27 March 2013 - 03:14 PM
Posted 28 March 2013 - 03:04 PM
As far as silver solder getting holes in it, I don't know for certain. I've done many many searches for silver's reactivity with ethanol and have yet to find any info. Anyone?
Posted 28 March 2013 - 09:48 PM
First the term silver solder is used by so many people for such a large number of compositions that it becomes misleading to use the term. Some people refer to the alloy of 95%tin and 5% silver melting about 450F as silver solder or phosph copper which has about 6% phospher 0 to 15% silver the rest copper melt around 1200F to be silver solder others think it must have a min of 40% silver to be called silver solder. Alcohol does not cause pits in silver. Have who ever told you that alcohol causes pits in silver solder to explain what composition he is referring to. I have been working with silver solder making things for over 40 years. I use so much that I just make my own. I like 75% silver 19% copper and 6%zinc. It gives me the ductivity similar to copper so I can hammer curved shapes and anneal at 1400 and not reflow the solder, it is very strong. Now welding technology is so advanced that I Tig weld most copper that is 48 oz or heaver. My tig is a Miller inverter with pulser control.
Posted 28 March 2013 - 10:05 PM
I will ask for more information about what type of silver solder he claims is pitted by alcohol.
Also tagged with one or more of these keywords: coppersmithing, copper still, rivets, manufacturing of still
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