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  1. Thanks so much to everyone here sharing their hard-earned knowledge. I'm making a 16 inch diameter column out of .125 copper, and have been particularly interested to hear thoughts on how to join the rolled shell. My original plan was to TIG with helium and pure copper filler, but the majority of advice that I've sought has discouraged me from even trying it, due to warping. Then I was fantasizing about using silver solder for this (since I've got stainless steel bolt flanges on each end that would help to deal with the hoop stress)...until reading PeteB's advice about corrosion. So now I'm inclined to braze using copper phosphate filler, but am thinking that the amount of heat applied will probably cause almost as much warping as TIG will cause anyways. Regardless of the method, I plan to use the plate assembly as an internal frame to keep things in place while joining...is there a chance that this will help to at least distribute the deformation and keep the column from getting really bad? Any thoughts are appreciated.
  2. Hedge, Thanks for posting about your fabrication process- looking forward to tracking your progress. You look to be past this stage now but thought I'd mention that we were able to source a larger size copper sheet- 72" x 48"- from Farmer's Copper in Texas.
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