[TheForge] brazing revisited

[Woolley]

Andy,

I have tig welded architectural bronze(zinc alloy) and could not avoid 
burning zinc.  Stay away from the fumes obviously and it doesn't hurt to 
coat you mucus membrane with milk before you weld.

Bill Woolley






Andy Gladish wrote:
> Thanks- the pencil trick worked very well with plumbing solder, but I  
> don't think it makes a strong enough joint- I'll try one of these with  
> silver braze.
> The Harris 15% silver really is a pleasure to use, though color match  
> isn't very good (on red brass pipe).
> So far best results come from TIG weld with Silicon Bronze filler, though  
> the zinc in the pipe has an annoying tendency to cook off at a few degrees  
> above welding temp...takes a light touch indeed to get a decent bead.
> There's a kind of momentum as I heat the pipe, once its hot enough to be  
> willing to weld, difficult to back off so that the zinc doesn't burn off.
> Fun stuff.
> andy
>
> On Thu, 28 Jan 2010 08:05:40 -0800, <Grover.Richardson at gtri.gatech.edu>  
> wrote:
>
>   
>> Lenox Sterling(r) ColdCoat(r) Thermal Shield Paste 32 oz. WS80326 1UYK4  
>> 36.60
>> Markal Cool Gel Heat Barrier Spray 16 oz. 83495G 2AGV8 13.92
>> Cool Blue(tm) Heat Sink Paste 11 oz. 91861 5KH10 11.48
>>
>> Just found this.
>>     
>>> From Grainger.com
>>>       
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