Classification depends on which component gives the system its essential character. If the resistance welding function is the primary purpose and the robot is the delivery mechanism, the cell may be classified as a welding machine under 73733. If the robot's programmable manipulation capability is the dominant feature, classification as an industrial robot may be more appropriate. A binding ruling is strongly recommended for high-value integrated cells.

A fully automatic machine performs the complete welding cycle — positioning, welding, and part transfer — without operator intervention. A partly automatic machine automates the welding cycle itself but requires manual loading, positioning, or unloading. Both fall under 73733; the distinction matters primarily for end-use documentation and may affect how the equipment is described in technical specifications for customs purposes.