[Shop-talk] Annealing Copper bars

Sat Aug 8 11:56:59 MDT 2020

Another option for you, find someone that has a kiln.  I have an old
electric kiln that I got for free because it was old.  I added a simple
thermocouple temperature gauge to it and it works great for annealing and
heat treating small parts.  My next project is actually adding solid-state
relays and a PID controller so I can do some more precise temperature
control.  If you do this, or use a modified oven, do be careful.  There is
a reason that oven doors lock at high temperatures.

On Sat, Aug 8, 2020 at 11:12 AM Jack Brooks <JIBrooks at live.com> wrote:

> I agree, but I’m not sure at what temperature the oven will release the
> latch and I’m not modifying the latch on a new Inductive range. <grin>
> Thought about it on the old over for making high temperature 900°F pizza,
> but that was the old oven…………
>
>
>
> The path forward using the oven is probably going to be the first step.
> If it gets me at or close to what I need, I will be done.  If not, I will
> get with my body guy and see if I can use his Oxy torch.
>
>
>
> Thanks everyone,
>
>
>
> Jack
>
>
>
> *From:* Shop-talk <shop-talk-bounces at autox.team.net> * On Behalf Of *John
> Innis
> *Sent:* Saturday, August 8, 2020 8:58 AM
> *To:* Pat Horne <patintexas at icloud.com>
> *Cc:* shop-talk <shop-talk at autox.team.net>
> *Subject:* Re: [Shop-talk] Annealing Copper bars
>
>
>
> The oven would work fine, you just need to add a quench as soon as
> possible when you come out.
>
>
>
> On Sat, Aug 8, 2020 at 10:43 AM Pat Horne <patintexas at icloud.com> wrote:
>
> So, referring back to the OP about using the oven to anneal the bars, it
> WOULDN’T be a good choice.
>
>
>
> Peace,
>
> Pat
>
> Pat Horne
>
> We support Habitat for Humanity
>
>
>
>
> On Aug 8, 2020, at 10:03 AM, John Innis <jdinnis at gmail.com> wrote:
>
> 
>
> This matches my understanding as well.  Brass and copper soften when
> quenched.  Steel and Aluminum harden when quenched.
>
>
>
> On Sat, Aug 8, 2020 at 9:59 AM Bob Spidell <bspidell at comcast.net> wrote:
>
> Could be (the plot thickens):
>
> "Annealing copper makes it softer and less brittle, which allows you to
> bend it without breaking it. This malleability allows you to hammer and
> mold the copper into any shape you wish without cracking the metal. You
> can anneal any grade and thickness of copper as long as you have a flame
> that can transmit enough heat to the metal. The most straightforward way
> to anneal copper is by heating it with an oxygen acetylene torch and
> rapidly cooling it in water."
>
> https://www.wikihow.com/Anneal-Copper
>
>
>
> On 8/8/2020 7:43 AM, Pat Horne wrote:
> > Maybe you’re right & I’m wrong! Wouldn’t be the first time.
> >
> > Peace,
> > Pat
> >
> > Pat Horne
> > We support Habitat for Humanity
> >
> >
> > On Aug 8, 2020, at 9:33 AM, Bob Spidell <bspidell at comcast.net> wrote:
> >
> > Well snap. I've been doing it wrong all these years I've reused copper,
> mostly on sealing washers for oil pan plugs.
> >
> > Thanks for the reply.
> > Bob
> >
> >
> >> On 8/8/2020 7:21 AM, Pat Horne wrote:
> >> I thought quenching made the metal less soft.
> >>
> >> Annealing requires slow cooling.
> >>
> >> Peace,
> >> Pat
> >>
> >> Pat Horne
> >> We support Habitat for Humanity
> >>
> >>
> >> On Aug 8, 2020, at 9:18 AM, Bob Spidell <bspidell at comcast.net> 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
> >>
>
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