Abstract: Aiming at the problems of manual welding with low efficiency and unstable quality for truck-wheel hub assembly,the structural characteristics and welding requirements of a heavy truck-wheel hub assembly,a orthogonal coordinates type automatic spot-welding robotics was designed.It expounded the project design of the automatic spot-welding robotics body and the application of control system.The performance of the automatic spot-welding robotics was verified by field experiment and industrial test.It could provide a reference method for automatic welding of the heavy truck-wheel hub assembly.

Key words: Truck-wheel hub assembly, Orthogonal coordinates, Spot-welding robotics, Structural design