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-------- Forwarded Message --------
Subject: Re: [Shop-talk] Annealing Copper bars
Date: Sat, 8 Aug 2020 10:57:35 -0400
From: Donald H Locker <dhlocker@comcast.net>
To: Bob Spidell <bspidell@comcast.net>
Hardening steel requires quenching to freeze in the carbide crystal
structure. Annealing steel requires slow cooling.
Copper (and Aluminum and others, but I don't have a list handy) will
annealed by heating and can be cooled quickly or slowly. They harden
with strain (bending or hammering or whatever.)
Donald.
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On 2020-08-08 10:18 a.m., Bob Spidell wrote:
> Question for the List: Is it proper to quench--in water, presumably, or
> oil maybe--copper to achieve softness after it's been heated 'cherry red?'
>
> Bob
>
> On 8/8/2020 6:43 AM, old dirtbeard wrote:
>> I sort of like your idea about the self-cleaning oven cycle. It would
>> be very even heat, the right temperature, should not hurt the oven.Â
>>
>> Maybe just wait to do it while the wife is away for an hour or so... :-)
>>
>> best,
>>
>> doug
>>
>> On Sat, Aug 8, 2020 at 5:37 AM Pat Horne <patintexas@icloud.com
>> <mailto:patintexas@icloud.com>> wrote:
>>
>> Pay a local shop with an oxy/acetylene rig to heat them? Muffler
>> shop, body shop, A/C contractor? A/C contractor sometimes use
>> air/acetylene. Will that get hot enough?
>>
>> Peace,
>> Pat
>>
>> Pat HorneÂ
>> We support Habitat for Humanity
>>
>>
>> On Aug 7, 2020, at 11:25 PM, Jack Brooks <JIBrooks@live.com
>> <mailto:JIBrooks@live.com>> wrote:
>>
>> 
>>
>> I have fabricated a number of 1/8 and 3/16^th inch thick busbars
>> for an Van RV build electrical system which I am assembling in my
>> shop. The busbars are already bent to shape, but Iâ??d like to
>> anneal them, because the copper was purchased in the  â??Half-Hardâ??
>> state and making them â??Dead-Softâ?? will insure that they lay
>> completely flat to maximize the conductivity when I final assemble
>> the system.
>>
>> Â
>>
>> I usually anneal copper by getting it hot enough to glow with a
>> propane torch and then allow it to cool. With the mass of these
>> busbars, I canâ??t get them up to a temperature to where they glow
>> with propane. An Oxy/Acetylene torch would work, but I donâ??t have
>> one. MAPP gas is hotter, but I donâ??t think itâ??s a lot hotter.
>>
>> Â
>>
>> I am considering running them through the cleaning cycle in the
>> self-cleaning over, as a self-cleaning oven will typically runs up
>> to around 900°F. Copper needs 700-1,200°F to anneal, so it should
>> be fine.
>>
>> Â
>>
>> Iâ??d prefer almost any other solution. Thoughts? The last time I
>> used our oven for a shop project, it was to cure the paint on the
>> jugs (cylinders) of my â??74 Norton motorcycle. Mrs. Jack was not
>> happy. Copper bars should be fine as they wonâ??t stink up the house.
>>
>> Â
>>
>> Thanks in advance,
>>
>> Â
>>
>> Jack
>>
>>
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