[modeleng] Re: Solder Qestion
- From: The Sheppard Residence <psbr20252@xxxxxxxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Wed, 26 Jul 2006 19:38:46 +0100
Bede,
Thanks for that.
I have an Elidir boiler that has developed a leak on the inner backhead!
An absolute nightmare of a place to get to. I can only see it using
an inspection mirror through the firehole.
I have some "proper" Comsol flux, but I may well try the Bridgit flux
from Reeves.
Cheers
Peter
Bede McCormack wrote:
> Well I've finally managed to seal up the old Conway boiler thanks to
> advice from the list group and want to report back.
>
> The short version is that, as we know, repairs like this require a
> thorough cleaning and opening up of the offending gap, then ample high
> temperature fluxing, then closing up the gap as much as possible (shim
> or tap the gap closed), then more flux and then very high heat to flow
> the comsol (296C, 564F) to a smooth finish over the leak. I used a
> scratch rod to help flow the comsol and add more flux while heating.
>
> Materials used: Comsol high temperature soft solder, and "Bridgit"
> burn-resistant soldering flux, both of which I got through Reeves. I
> guess the comsol is from Johnson Matthey in the UK
> <http://www.jm-metaljoining.com/index.htm>, but the flux is actually
> sold by a US company, J.W. Harris in Mason, Ohio, though its actually
> made in Mexico... <http://www.jwharris.com/home/> I tried other
> fluxes (Oatey), but they blackened before the solder melted and made a
> mess. The Bridgit stuff stayed clear throughout the heating and seemed
> to have worked fine, it contains Zinc Chloride, so presumably etched
> into the metal a bit.
>
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