Winston fired this volley in
:

Heh! I asked Ernie about reassembling my 10" chef's knife with
*Real* silver solder. He advised the use of the *barely* silver
solder rather than the real stuff because of possible temper loss.

Ergo, I figured that my Oatey 5% lead-free, cadmium-free would be
plenty good for bandsaw blades.

Now I'm confused.

Plumbing solder is a "soft solder". It's designed to melt at low
temperatures, is brittle when frozen, and is NOT designed to be
structural in any sense -- it's job is to seal a joint well against
leakage when sweated properly.

Your knife repair would have been better served by making the repair with
a good hard solder, then re-hardening and re-tempering the blade.

LLoyd