Based on the analysis of the welding of flat steel

an automatic welding system is designed by using the XDM PLC as the main controller

and the three-axis motion mechanism and the R-axis rotation mechanism as actuators. According to working requirements

such as four-dimensional space degree of freedom welding requirements

system hardware configurations

the actuator design

system hardware selection

and the hardware connection form of the system are determined at first. In this paper

the composition and working principle of the automatic welding system are introduced

focusing on the coordinate transformation relationship in the visual measurement

and the calibration process is given. The compensation methods after the rotation of the welding gun at each inflection point are discussed

and the different welding parameters are used according to different seam types during the welding process. The flow chart of control program is given out for the welding gun attitudes adjustment. The welding test result shows that this designed system can track the welding seam quite well and welding quality is satisfying

the more

this system can improve the welding efficiency greatly.