Electron beam brazing temperature fuzzy control system

The workpiece temperature fuzzy control technology was used in the electron beam brazing process.The system integrated EBW process control,electron beam scanning track control,workpiece temperature fuzzy control,welding data high-speed acquisition and storage.Through the programming and control of the electron beam scanning tracks,the energy input requirements of curve brazing joints with various shapes could be satisfied.During the scanning and heating process with the electron beam,the temperature signals of the workpiece were obtained on-line and compared with the set value,so as to get the error and the error change rate of the joint temperature,which acted as the two inputs of the fuzzy controller.The fuzzy controller gave appropriate control amounts according to its inputs to adjust the electron current,and the closed-loop control of brazing temperature was realized.The experiment results showed that ideal control characters could be obtained if fuzzy control technology was used in the electron beam brazing process.The control system had fast response speed,short settle time,small steady-state error and small overshoot.