Waiting to hear
You would join it differently if it was welded, of course. You'd grind a V butt on the disc, locate it, and then just fill it with weld, so effectively you would have as much weld surface joint as the soldering.
I can see it does a wonderful joint, but there has to be a limit somewhere where you say 'sorry, but we need to weld that' like a major structural joint, for example.
I addition a good weld will hold to the melting point of the parent metal - and I'd guess that silver solder gives up at a much lower temperature, especially when stressed.