High performance, fast response, and stable positioning of servo motors; Combined with stable hydraulic pressure and high pressure regulation output; Integrating servo and hydraulic advantages. The use of servo motors ensures high-speed, precise, and smooth round-trip of the leveling car. Using hydraulic pressure for fast, stable, and precise pressure compaction of welds, using proportional valves and digital adjustment of pressure on the operation panel, the output is precise and reliable, and the quality of the welding seam is even better.