[Noisebridge-discuss] soldering copper sheet metal

jim jim at well.com
Thu Oct 29 20:43:04 UTC 2015


Thanks, Musti,
     What the hey! I'll try it.



On 10/29/2015 08:26 PM, Musti wrote:
> Hi Jim,
>
> depends on what you are trying to do, but maybe just use spot welding?
>
> You might as well try Aluminum soldering flux, which enables to solder
> it like a charm, if you ahve the right thin it will . This flux smells
> really really bad.
>
> Kind regards,
> Musti
>
> On 29.10.2015 21:18, jim wrote:
>>
>>      Nothing's working. I talked to two different
>> experts, one a plumber the other a bike mechanic.
>> both are surprised and both guess that the copper
>> sheets (12" wide copper rolls I bought from R. H.
>> Leahy in SF) must have a tiny amount of oil that's
>> embedded a couple or atom's distance into the
>> surface of the copper.
>>      I've tried various fluxes, washed 'em with
>> borax, lye, sodium carbonate (all high base), and
>> with alcohol, paint thinner, acetone, and muriatic
>> acid. I've scoured 'em with fine and with coarse
>> sand paper, by hand and with an electric hand
>> sander.
>>      My heat sources have been a propane torch and
>> also a 950 degree soldering iron. I've used tin-
>> lead and also silver solder.
>>
>>      The result is that the solder burns and
>> browns with what seems like little disks from
>> popped bubbles and all solders bead up and roll
>> off.
>>
>>      Somebodies know how to work with sheet copper
>> to make rain gutters, art, etc.
>>      I've looked into copper glues, and reviewers
>> warn that some products are of poor quality, other
>> products work but cannot withstand mechanical
>> stress....
>>      I'm gonna try adhesive copper tape, maybe
>> double it up if I need the strength.
>>
>>
>>
>> On 10/25/2015 11:58 PM, Cere Mona Davis wrote:
>>> There is a special kind of flux for solding to copper. . Seen it at
>>> ace hardware.  Alternately, you can possibly try borax with a little
>>> water.
>>>
>>> On Oct 25, 2015 4:37 PM, "jim" <<mailto:jim at well.com>jim at well.com> wrote:
>>>
>>>
>>>          I've soldered electronics and plumbing and
>>>      am stuck trying to solder copper sheet metal.
>>>      I've used a soldering iron and a propane torch.
>>>      I've used alcohol, acetone, and paint thinner
>>>      to clean the copper as well as fine and coarse
>>>      sandpaper to clean the surfaces. I'm using
>>>      electronic flux (haven't yet tried plumbing
>>>      flux).
>>>          The soldering is not working: solder does
>>>      not flow or adhere to the copper, and there's
>>>      a brown residue that appears after heating.
>>>      Using a torch for forty or fifty seconds
>>>      results in flame that does not immediately
>>>      expire.
>>>
>>>          Anybody got tips?
>>>
>>>
>>>
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>>>
>>
>>
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