<html>
<head>
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<br>
<font face="monospace"> I've uploaded photos of my failed
attempts to <br>
solder copper sheet metal : <br>
<br>
<a class="moz-txt-link-freetext" href="http://www.systemateka.com/Copper/">http://www.systemateka.com/Copper/</a> <br>
<br>
<br>
Each of the three jpg files shows the same things <br>
from different camera POVs. <br>
<br>
The longest copper strip separates the foreground <br>
attempts, tried various types of glues from the <br>
background attempts, tries with various types of <br>
solder and flux. <br>
<br>
The soldering iron advertised 950 degrees F; the <br>
(blue) propane advertised 2000 degrees F; the (yellow) <br>
MAP advertised about 3000 degrees F. <br>
Each got the copper (30 gauge and 24 gauge) hot <br>
enough to melt the solder. The propane was hot enough <br>
to get the copper bright rid. The MAP was hot enough <br>
to vaporize the copper and let a little drop of <br>
molton copper fall. <br>
<br>
My interpretation of the dark brown residue on <br>
the pieces in back is that is cooked rosin. <br>
<br>
I've tried various glues: goop, water weld, <br>
super glue, krazy glue, liquid nails.... None of <br>
them hold enough to resist being pulled apart (with <br>
mild force). <br>
<br>
I believe it'll be best for us to find someone <br>
who can do the work: we have various models to show. <br>
<br>
Anybody interested in taking this project on? My <br>
guess is four to eight hours total, flexible time. <br>
<br>
Hopefully, with thanks, <br>
jim <br>
<br>
<br>
<br>
</font><br>
<div class="moz-cite-prefix">On 11/01/2015 03:34 AM, jim wrote:<br>
</div>
<blockquote cite="mid:5635885C.5090803@well.com" type="cite">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
<br>
<font face="monospace"> oh: yes, I want to solder the pieces
together. <br>
I've tried with clamping--no dice. <br>
<br>
</font><br>
<div class="moz-cite-prefix">On 11/01/2015 03:28 AM, jim wrote:<br>
</div>
<blockquote cite="mid:563586EB.7070001@well.com" type="cite">
<meta content="text/html; charset=windows-1252"
http-equiv="Content-Type">
<br>
<font face="monospace"> yes. I've cut small pieces of 30
gauge and also 24 <br>
gauge and have tried to tin them (tin 'em first, then <br>
solder them together, yes?) with horrid results: a dark <br>
brown crust develops that shows little round pin-head <br>
sized circles and the solder just sits in a ball and <br>
then rolls off. <br>
I've used two different types of flux and various <br>
types of solder (tin-lead, silver...). <br>
I've gotten the copper bright red with a propane <br>
torch. I've used a soldering iron. <br>
I've washed them with alcohol, paint thinner, and <br>
muriatic acid; I've also washed them with a solution <br>
of lye and sodium carbonate and borax. I've sanded <br>
them with fine and with coarse paper, by hand and <br>
with an orbital sander. <br>
<br>
In the past I've soldered electronic circuits and <br>
copper pipe successfully. <br>
A couple of experienced people say it sounds like <br>
the surface of the copper sheets is contaminated, but <br>
golly! After all that scrubbing and washing and flux <br>
and heating? <br>
<br>
<br>
</font><br>
<div class="moz-cite-prefix">On 11/01/2015 03:08 AM, Cere Davis
wrote:<br>
</div>
<blockquote
cite="mid:CAKtSE-vPeV=rciwXWxZgWrwNBWTaizZ_bcicX+yoypjYrAaxWw@mail.gmail.com"
type="cite">
<p dir="ltr">So ur just trying to solder copper to copper? </p>
<div class="gmail_quote">On Oct 25, 2015 4:37 PM, "jim" <<a
moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:jim@well.com"><a class="moz-txt-link-abbreviated" href="mailto:jim@well.com">jim@well.com</a></a>> wrote:<br
type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
I've soldered electronics and plumbing and<br>
am stuck trying to solder copper sheet metal.<br>
I've used a soldering iron and a propane torch.<br>
I've used alcohol, acetone, and paint thinner<br>
to clean the copper as well as fine and coarse<br>
sandpaper to clean the surfaces. I'm using<br>
electronic flux (haven't yet tried plumbing<br>
flux).<br>
The soldering is not working: solder does<br>
not flow or adhere to the copper, and there's<br>
a brown residue that appears after heating.<br>
Using a torch for forty or fifty seconds<br>
results in flame that does not immediately<br>
expire.<br>
<br>
Anybody got tips?<br>
<br>
<br>
<br>
_______________________________________________<br>
Noisebridge-discuss mailing list<br>
<a moz-do-not-send="true"
href="mailto:Noisebridge-discuss@lists.noisebridge.net"
target="_blank">Noisebridge-discuss@lists.noisebridge.net</a><br>
<a moz-do-not-send="true"
href="https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss"
rel="noreferrer" target="_blank">https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss</a><br>
</blockquote>
</div>
</blockquote>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Noisebridge-discuss mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:Noisebridge-discuss@lists.noisebridge.net">Noisebridge-discuss@lists.noisebridge.net</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss">https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss</a>
</pre>
</blockquote>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Noisebridge-discuss mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Noisebridge-discuss@lists.noisebridge.net">Noisebridge-discuss@lists.noisebridge.net</a>
<a class="moz-txt-link-freetext" href="https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss">https://www.noisebridge.net/mailman/listinfo/noisebridge-discuss</a>
</pre>
</blockquote>
<br>
</body>
</html>