The hardware and software of the mobile welding robot were designed based on the rotating arc
and the motion performance of the left and right wheels and the cross slider of the welding robot were tested respectively. The hardware and software after the design were verified by welding. The results show that the speed of the left and right wheels
the horizontal slider and the speed of the trolley increase with the increase of the pulse
while the tension of the left and right wheels gradually decreases with the increase of the pulse. With the designed hardware and software
the mobile welding robot can track the welding seams of various shapes.