Abstract: In order to raise the productivity and heighten the quality in welding the plastics plate sandwiched with steel wires,this paper has developed a controller for the specialized combined welding machine.This device has two operational modes:single timing and dual timingpositioning,which enables the weldillg current to be feed back controlled and,therefore,increasesthe relability of this machine unit.Practices have shown a significant increase ill working efficiency and weld quality.