[DeTomaso] Brazing

gow2 at rc-tech.net gow2 at rc-tech.net
Thu Oct 25 08:54:32 EDT 2012


Do you use flux if you braze with a Tig Welder?

I don't braze very much but I did braze a brass fitting onto a air purge
valve this weekend and I used no flux (of course the gas is shielded). It
worked out well.

http://www.rc-tech.net/cars2/panttransam/cooling/cool2.jpg





> It sounds like a flux failure (not Capacitor Flux).  Maybe the base that
> you
> are brazing to is not prefluxed enough.  I was taught to use Borax as
> emergency flux or a commercial powder flux.  Preheat the brazing rod and
> dip
> it in the flux for a good covering and preheat the area to be covered and
> sprinkle a small amount of flux on the area.  The preheat should be enough
> to liquefy the flux where it touches the metal.  I have never used the
> flux
> coated rods but they may have a moisture problem like fluxed weld rods.
> You
> might put them in an oven for a few hours at a very low temp to remove
> humidity from the flux covering.
>
> As usual YMMV,
> jerry
> ----- Original Message -----
> From: "David Fisher" <fisher95020 at gmail.com>
> To: "DeTomaso Forum" <detomaso at realbig.com>
> Sent: Thursday, October 25, 2012 2:46 AM
> Subject: [DeTomaso] Brazing
>
>
>> Any of you craftsman  out there that can tell me why my brazing is
>> sometimes porous?  I am getting tiny little holes in the brass.
>>
>> Too much heat, oxygen, not enough, etc?   Anyone found any good online
>> resources for this?
>>
>> I know it's a bit of a lost art, but I find myself doing it occasionally
>> on
>> my Jaguar as that was the factory practice.
>>
>> Pic attached
>>
>> http://www.poca.com/index.php/gallery/?g2_itemId=38384
>>
>>
>> Thanks
>>
>> David
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