Mine is only a small saw turning on 2 x 6" wheels, I dunno if I would trust silver solder to be strong enuf.
But that ain't the point, the point is "fit for purpose" these are brand new not reconditioned or at least that's what I paid for and that's what I expect.
Each blade has to be set for it's own use and getting 4 x 4" cuts simply is not good enuf init?