A component feed system for a press welder for resistance welding, wherein said press is of the type comprising: - a welding cylinder connected to an upper electrode; - a lower electrode, equipped with a centering pin; wherein the upper electrode and the lower electrode are aligned along an axis on which the upper electrode can move, moving closer to or away from the lower electrode, by means of the actuation of the welding cylinder; wherein the system comprises: - a component feed tube connectable to a piece of equipment for feeding said components; - a component feed head connected to the tube, wherein said head is arranged on the axis defined by the electrodes (3, 4), at a height above the height of the lower electrode; wherein said head is equipped with housing clamps for housing the components coming from the tube; wherein said clamps comprise an opening mechanism, with said opening mechanism being operable by means of the pressure or the downward movement performed by the upper electrode; and wherein the separation of the clamps, once opened, is such that it allows the passage of the upper electrode therethrough in said movement; and characterized in that: the system further comprises a guide cylinder connected to the head, and wherein said guide cylinder is in an integral manner attached to the welding cylinder through an attachment element; wherein the connection between the guide cylinder and the head is performed by means of a guide piston, wherein said piston can move relative to the guide cylinder, along an axis substantially parallel to the axis of movement of the welding cylinder; and wherein the guide piston comprises a movement stop, wherein said stop configures a retention position for the guide piston, after which said piston is moved backward relative to the guide cylinder given the forward movement of the welding cylinder and of the upper electrode, relative to the lower electrode. - a welding cylinder connected to an upper electrode; - a lower electrode, equipped with a centering pin; wherein the upper electrode and the lower electrode are aligned along an axis on which the upper electrode can move, moving closer to or away from the lower electrode, by means of the actuation of the welding cylinder; wherein the system comprises: - a component feed tube connectable to a piece of equipment for feeding said components; - a component feed head connected to the tube, wherein said head is arranged on the axis defined by the electrodes (3, 4), at a height above the height of the lower electrode; - a component feed tube connectable to a piece of equipment for feeding said components; - a component feed head connected to the tube, wherein said head is arranged on the axis defined by the electrodes (3, 4), at a height above the height of the lower electrode; wherein said head is equipped with housing clamps for housing the components coming from the tube; wherein said clamps comprise an opening mechanism, with said opening mechanism being operable by means of the pressure or the downward movement performed by the upper electrode; and wherein the separation of the clamps, once opened, is such that it allows the passage of the upper electrode therethrough in said movement; and characterized in that: the system further comprises a guide cylinder connected to the head, and wherein said guide cylinder is in an integral manner attached to the welding cylinder through an attachment element; wherein the connection between the guide cylinder and the head is performed by means of a guide piston, wherein said piston can move relative to the guide cylinder, along an axis substantially parallel to the axis of movement of the welding cylinder; and wherein the guide piston comprises a movement stop, wherein said stop configures a retention position for the guide piston, after which said piston is moved backward relative to the guide cylinder given the forward movement of the welding cylinder and of the upper electrode, relative to the lower electrode. the system further comprises a guide cylinder connected to the head, and wherein said guide cylinder is in an integral manner attached to the welding cylinder through an attachment element; wherein the connection between the guide cylinder and the head is performed by means of a guide piston, wherein said piston can move relative to the guide cylinder, along an axis substantially parallel to the axis of movement of the welding cylinder; and wherein the guide piston comprises a movement stop, wherein said stop configures a retention position for the guide piston, after which said piston is moved backward relative to the guide cylinder given the forward movement of the welding cylinder and of the upper electrode, relative to the lower electrode.