Methods of manufacturing golf club heads

A method of manufacturing a golf club head comprising the steps of:

• casting from a first metal material a variable thickness golf club face component comprising a striking face, a rear surface opposite the striking face, and a recess disposed in an upper toe region of the rear surface;
• metal injection molding a weight plate from a second metal material, the weight plate having approximately the same size and shape as the recess;
• placing the weight plate within the recess;
• electrical resistance welding at least four different regions of the weight plate to the face component to form a combined part;
• and
• applying a first finish to the combined part,
• wherein the step of casting the face component comprises integrally forming a plurality of scorelines in the striking face,
• wherein the second metal material has a higher density than the first metal material.

A method of manufacturing a golf club head comprising the steps of:

• metal injection molding from a first metal material a variable thickness golf club face component comprising a striking face and rear surface opposite the striking face;
• metal injection molding a substructure from a second metal material, wherein the substructure is separate from the face component;
• semi-permanently affixing the substructure to at least a portion of the rear surface of the face component;
• electrical resistance welding at least four different regions of the substructure to the face component to form a combined part with a weld bead;
• and
• finishing the combined part to cover the weld bead and form a finished club head,
• wherein the step of metal injection molding the face component comprises integrally forming a plurality of scorelines in the striking face.