[BC] brazing

[JYRussell@academicplanet.com]

But do remember that wonderful zinc smoke from the galv is NOT good for you.
(arc weld seams inside a galv tank for a while.... that'll teach ya.)
Jason
----- Original Message -----
From: "Cowboy" <curt at spam-o-matic.net>
To: "Broadcast Radio Mailing List" <broadcast at radiolists.net>
Sent: Sunday, May 22, 2005 7:56 AM
Subject: Re: [BC] brazing


> On Friday 20 May 2005 21:51, Milton R. Holladay Jr. wrote:
> > 15%,10%, 7%, 5%, or even 0% silver, Sta-silv, Sil-phos, or whatever
other
> > name it may go by, the flattened rods used by AC techs and plumbers, all
> > work fine, no flux required or needed, as long as there is no encrusted
> > stuff on the copper; a carburizing flame will remove the
> > tarnish.............
>
>  I've found that flux is needed in only very, very few cases.
>  ( or a wire brush. If the material is clean, the just go with it.
>  If not, CLEAN it first )
>
> > The toughest thing that I've attached to is galvanized steel. Usually,
it
> > works to use a BIG torch and flow some brass rod onto/into the surface
and
> > silver solder the copper to that..........
>
>  Galvanized is no different that raw steel, but first remove the galv !
>  Just can't braze anything to a galv coating.
>
>  Generally, I'll heat the intended braze track of the galv, then wire
brush.
>  Usually, the galv comes off where heated almost allways.
>  If not, re-heat that strip, and brush again.
>  Then, tin the raw steel with whatever rod you're using.
>  Finally, lay in the copper, and make the final braze.
>
>  Then, of course, cold-galv the joint, lest the steel rust where the galv
>  has been removed.
>
>
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