Socket joints were used to join the pieces together, with the male element on one piece fitting into the female element of the next piece. When molten bronze was then poured into the joint, it would harden and join the pieces together while preserving the smooth outer surface.
也就是銅人的模型是分成多部份組接而成，接鑄時必須有上下大小的母子口沿，使得母口包住子口，在銅液冷縮時可以緊密結合，並使外觀平整。