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:-)
		 
		
		
		
		
		
		
		
	 |