[Shop-talk] Annealing Copper bars
Bob Spidell
bspidell at comcast.net
Sat Aug 8 08:18:02 MDT 2020
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.
>
> 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 at icloud.com
> <mailto:patintexas at 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 Horne
> We support Habitat for Humanity
>
>
> On Aug 7, 2020, at 11:25 PM, Jack Brooks <JIBrooks at live.com
> <mailto:JIBrooks at 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 I’d like to
> anneal them, because the copper was purchased in the “Half-Hard”
> state and making them “Dead-Soft” will insure that they lay
> completely flat to maximize the conductivity when I final assemble
> the system.
>
> 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 can’t get them up to a temperature to where they glow
> with propane. An Oxy/Acetylene torch would work, but I don’t have
> one. MAPP gas is hotter, but I don’t think it’s a lot hotter.
>
> 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.
>
> I’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 ’74 Norton motorcycle. Mrs. Jack was not
> happy. Copper bars should be fine as they won’t stink up the house.
>
> Thanks in advance,
>
> Jack
>
>
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