The only time I have heard for doing that pre HT is David Boye's method of using say, brass fittings and brazing it on with brass brazing rod. Hard solder won't work because it will melt in the HT. It either has to have a higher melting temp than the HT, or lower than the temper. Anything in between will not work unless its done seperate the blade, such as on the pommel.
Btw I've heard a heat gun works really well for 400F solder, rather than a torch.
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