In article 1129847416.285947.302270
@g47g2000cwa.googlegroups.com, says...
Hello Wayne,

Thanks for the suggestions. I really am using 100% copper (Alloy 110).


I'll second Wayne's recommendation of phos/copper brazing.
It's relatively inexpensive and a pretty good color match
for pure copper. I've brazed heavier (though not as long)
sections of copper bus bar than what you're looking at
using oxy-propane.

Ned Simmons