On 20 Oct 2005 14:01:56 -0700, wrote:

I will be making a gate for the entrance to a house and will need to
join some thick copper rectangular bar. The 0.5" x 1" 110 copper bar is
for the gate frame and the infill of the gate will mostly be .5" x .5"
square copper rod.

It might be possible with the TIG if you can insulate and preheat
enough but copper is such a good conductor of heat that it wouldn't be
easy.

As for brazing it's definitely possible if you use the right filler
rod. If this is really copper (and not brass or bronze) then I'd
recommend using Sil-fos, Sil-flux or any of the other trade names for
the 90-95% copper, 5-10%silver, and trace amounts of phosphorus for
fluxing rods. Refrigeration contractors use this rod for joining
copper tubing and it's great for that job. No flux is needed do to the
phosphorus in the rod.

Wayne Cook
Shamrock, TX
http://members.dslextreme.com/users/waynecook/index.htm