A plug connector assembly includes: a mating member; a cable; a printed circuit board (PCB) interconnected between the mating member and the cable; a metal shell enclosing the PCB, a rear of the mating member, and a front of the cable, the metal shell including an upper shell part and a lower shell part both welded to the rear of the mating member; and an insulative outer shell enclosing the metal shell, the rear of the mating member, and the front of the cable, wherein the upper shell part is welded to the lower shell part.