Method for combining heterogeneous metal parts

A method for combining heterogeneous metal parts, comprising steps of:

• a) disposing a first metal part and a second metal part in a lower mold cavity of a lower mold, the first metal part and the second metal part being made of different materials, wherein the lower mold cavity has a lower portion, and an upper portion on which the first metal part and the second metal part are disposed spaced apart laterally, a top surface of the first metal part and a top surface of the second metal part being disposed outwardly of the lower mold, the lower mold including a channel that extends from an inner surface in the lower portion of the lower mold cavity to an outer surface of the lower mold and that communicates the lower portion with an external environment;
• b) combining an upper mold and the lower mold with an upper mold cavity of the upper mold facing the lower mold cavity, wherein the upper mold cavity is recessed from a combining surface of the upper mold in a direction away from the lower mold to terminate at an inner base surface, and is defined by the inner base surface and an inner surrounding surface that interconnects the combining surface and the inner base surface, the combining surface of the upper mold being in contact with the lower mold when the upper mold and the lower mold are combined, the inner base surface being in contact with the top surface of the first metal part and the top surface of the second metal part after combining the upper mold and the lower mold;
• and
• c) injecting a bonding adhesive into the channel so as to fill the lower portion of the lower mold cavity and a gap between the first metal part and the second metal part with the bonding adhesive, wherein the bonding adhesive has a viscosity so that the bonding adhesive is unable to flow outside the lower mold after being injecting into the channel.