[modeleng] Re: Solder Qestion

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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