All-position Automatic Welding Control System Based On80C196MC

With the development of industrial technology, pipeline network continuously transporting the oil, gas, water and other resources, is industrial artery. And pipe welding is the key to the pipeline laying. Welding quality directly affects the engineering quality, relating to the service life of pipeline. The traditional pipe welding generally uses the welding rod arc welding and completes through manual welding. However, for large diameter pipe welding, more workers are needed, while welding speed and welding quality is relatively low, and welding costs more. Therefore, in order to improve the production efficiency, reduce labor intensity of workers and aim at the need of pressure pipe welding, it is necessary to exploit pipes of all position automatic welding system.The control system selects80C196MC chip as controller. The basic unit is configurated and the circuit is expanded through the chip. A serial communication interface welding power control and PWM power driver interface DC are designed.It chooses servo motor as drive motor. Through MCU control, welding car smoothly walks and swing of the welding torch adjusts. In this paper, the hardware circuits and software components of the control system are designed, and computer simulation and testing are conducted. The simulation test results prove that the design is reasonable, operation are stable, the parameters are correct. It achieves the purpose of the initial design.Motor starts, stops and welding speed are controlled by the MCU control. Arc voltage and current are controlled. Through data conversion channel and I/O port, the signal will be fed to the microcontroller. The microcontroller outputs signal to control the welding process. Through sensor, feedback of welding procedures and welding state are completed. The host computer and the controlled boxes constitute welding control system. Through serial communication, the host computer transport the welding parameters and control program to the next crew in order to complete the motion control and welding mode conversion.DC motor speed and the PID adjustment program are designed. Speed control via PWM to change the effective voltage are achieved. Anti-jamming design, man-machine interface and control system ensure that users of real-time control of the welding process. The welding parameters are timely modified by hand-held remote control box according to the actual situation of the welding site. It is flexible to control and easy to operate. By controlling single-chip, the operator can control the voltage of the arc welding process, welding current and car speed.Finally, hardware circuit of the control system is simulated using computer. Through comparing the measured PWM wave and calculating theory, we can see the results are consistent and achieve the normal operation of the motor and feedback control. It achieves the desired objectives of the paper.The results show that the control system is reliable. Walking control of welding car and swing adjustment of the welding gun control can be achieved. In the welding process we can modify the welding parameters according to the situation in a timely manner. The operator can do real-time control through the display of the status of welding. It is flexible, convenient in operation, in line with the welding process requirements. The completion of the pipeline can be highly efficient in all-position welding and achieves the desired goal.