I have found that a tapered (scarf) joint of about 3/16" long and silver solder is stronger than the original weld.? I take either a ribbon of 55% silver solder or a round piece hammered flat and I place it between the two pieces of blade (held under a little tension) in a home made fixture along with SS flux between the clean blade surfaces.? Then I heat it up with a propane torch until I just see it melt.? Then I remove the heat.? I get much better results than if I try to add silver solder to the joint.? When I added silver solder to the joint, the flux sometimes burned and interfered with the SS.? After, I anneal the blade with a propane torch.??