Movable welding robot for 8-shaped expansion corrugated pipe and design method of movable welding robot

The invention discloses an 8-shaped expansion corrugated pipe mobile welding robot and a design method thereof. The design method specifically comprises the steps that an expansion corrugated pipe welding line curve fitting equation is established; designing a profiling track; the specification of a transmission chain is selected, and the included angle between every two adjacent chain links on each segmented track is calculated; solving a chain transmission force attenuation coefficient of each segment; selecting the model and number of driving motors; and processing a sample machine for experimental verification. The welding quality and efficiency of the expansion corrugated pipe in the oil exploration field are improved, the technical bottleneck that high-quality automatic welding cannot be achieved in deep well cementation in the oil exploration field in China is solved, and reference is provided for configuration design of an automatic welding robot for complex special-shaped section welding seams; the d