[modeleng] Re: TIG welded copper boilers - now arsenical copper

Peter,

From this site:-
http://mysite.du.edu/~jcalvert/phys/arsenic.htm

There's this snippet at the bottom of the article-

Smaller amounts of arsenic raise the annealing temperature of copper, so 
that copper intended to be toughened by work hardening does not be come soft 
when exposed to heat. This was important in the fabrication of copper 
locomotive fireboxes, long used in Britain from a distrust of steel in this 
application. Arsenical copper is strong and very tough. Arsenic does destroy 
the conductivity of copper, so if a tough and still highly conductive copper 
is required, cadmium is used in place of arsenic.

Cheers,

JohnP
----- Original Message ----- 
From: "TEL" <tel47@xxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Monday, October 27, 2008 6:59 AM
Subject: [modeleng] Re: TIG welded copper boilers


Dunno, but the time honoured test for the weldability of copper is to
heat a sample up and bash it with a 'ammer - if it crumbles it can't be
welded.

peter.chadwick@xxxxxxxxxxx wrote:
> I read that 12 inch to the foot models need an arsenical copper for
> fireboxes, and it's hard to get. What is so special about arsenical copper
> in this applications?
>
> ----------
> Zarlink Semiconductor Limited is a Company registered in England and Wales
> under number 00705031 with its registered office at Cheney Manor, Swindon,
> Wilts SN2 2QW, England.
>
> This email is confidential and may contain information that is privileged 
> and
> exempt from disclosure by law.  If you have received it in error, please 
> contact
> the sender immediately by return email and then delete it from your 
> system; you
> should not copy it or disclose its contents to anyone.  Emails are not 
> secure
> and cannot be guaranteed to be error free as they can be intercepted, 
> amended,
> lost or destroyed, or contain viruses.  Anyone who communicates with us by 
> email
> is taken to accept these risks.
>
>
> MODEL ENGINEERING DISCUSSION LIST.
>
> To UNSUBSCRIBE from this list, send a blank email to,
> modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject 
> line
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to,
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject 
line.



--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.175 / Virus Database: 270.8.3/1747 - Release Date: 26/10/2008 
09:27


MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to, 
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.

Other related posts: