For the best look 56% silver is recommended. I did several racks with it, all without perfect cleaning before brazing, they all last. The last time, I put small cut offs inside the tube, so the fillets became really small and beautiful.
I usually have my current set on 80 amps and then just foot-pedal it. But RN, doing a lot of work on this rack, I’ve turned it down a bit to maybe 70 or 75 or so. You want to avoid melting the parent metal and mixing it in with the braze as much as you can.
This is the wire I’m using (not cheap!) It’s a UK one, but I’m sure there are US equivalents. It’s basically “silicon bronze”.
I bought quite a lot of it a few years ago when I don’t think it was quite so expensive!
https://www.boconline.co.uk/shop/en/uk/sifsilcopper-968-tig-wire-sifsilcopper-968-tig
Awesome, thanks! I’ll start looking for some silicone bronze tig rod. Are you using 1.2mm rod size?
I use 1.6mm You want to shove in quite a bit of filler so a slightly bigger size is desirable (I use 1.0mm for the actual welding of the frame).
Here’s a picture of one of the joints. They seem to be pretty strong.
For my personal stainless steel racks, I’m willing to experiment with silicone bronze. I have been brazing stainless with nickel silver and have had great success but it can be very time consuming. The last stainless rack I made had over 30 brazed connections, it took a couple days to complete.
Sorry for hijacking!
Holy moly 30?
Thanks for everyone’s input, I did find a European based supplier yesterday for 45% silver so I think when I have a go at it I’ll use that. It’s a bit less expensive than 56 anyway too 
This popped up on my fb marketplace. Would be a good deal and starting place for someone in the UK.
