Soldering uses tin or zinc and those are very soft. They are good for repairing houseware or joining wires, but not for much else.
Not being a metallurgist of any sorts, how about brazing? Apparently it provides much stronger bond. In fact, it is a subdivision of soldering, only it uses brass. Brazing was used on bronze Sumerian swords 3000 years BC. I can’t remember where I read that brass and especially silver brazing bond is stronger than the steel parts they are joining.
I have a composite Indian sword with a S.Indian straight blade 14-17 century and a basket hilt 16-18 century joined by extensive brazing. When, - is another question :-), but historically they might have been married 300-400 years ago. And still holding strong:-)
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