[DeTomaso] Brazing

Jerry R Knotts knottsj at galstar.com
Thu Oct 25 09:00:53 EDT 2012


Should not have to use flux with a tig.  It is not providing oxygen as a 
part of the flame and encloses the braze flow area in gas.  Have never used 
a TIG for that because when I was using brazing TIGs were very expensive.

jerry
----- Original Message ----- 
From: <gow2 at rc-tech.net>
To: "Jerry R Knotts" <knottsj at galstar.com>
Cc: "DeTomaso Forum" <detomaso at realbig.com>
Sent: Thursday, October 25, 2012 7:54 AM
Subject: Re: [DeTomaso] Brazing


> 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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