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Isn't silver soldering high temp soldering? It is a form of brazing as far as I know. Also a lighter flame I think is in the 600-800 C which will blow the temper of the blade too.
I personally...

Forget about any kind of weld/solder or glue to try and fix this.
Welds are done at temperatures that will most likely blow the temper on the blade. Solder is not hard so not going to work at all,...