Patent ID: 7804039

Claim:
A melt bonding and liquid phase diffusion bonding method of a metal machine part, characterized by interposing an amorphous alloy foil for liquid phase diffusion bonding between a first bonding face of a first metal material and a non-beveled second bonding face a second metal material, wherein said first bonding face forms a V-bevel which contacts said non-beveled second bonding face at the tip of said V-bevel through said amorphous alloy foil, performing primary bonding by melt bonding said amorphous alloy foil and said first and second metal materials to form a joint, wherein said primary bonding comprises (i) passing an electrical current across said first and second metal materials through said V-bevel tip and said amorphous alloy foil to heat said V-bevel and said amorphous alloy foil and (ii) applying a pressing stress such that said V-bevel and said amorphous alloy foil are melted and said V-bevel is collapsed to form said joint, then performing secondary bonding by reheating said joint to at least the melting point of said amorphous alloy foil, and allowing an isothermal solidification process of said joint to complete.