The working principle of the automatic hobbing welding machine is as follows: First, the steel bar that needs to be welded is placed in the corresponding position of the hobbing welding machine according to the design requirements. After the equipment is started, the welding roller is rotated by the driving device. These rollers roll along the outer perimeter of the rebar skeleton while applying pressure and heat to the rebar. Under the action of pressure and friction heat, the contact parts of the steel bars gradually reach the welding temperature, and local melting occurs and mutual fusion. With the continuous rolling of the roller, the welding process is gradually carried out along the length direction of the steel bar skeleton, so as to achieve continuous welding of the steel bar and form a solid steel bar skeleton structure. In the whole process, the control system precisely controls the roller movement speed, pressure, welding time and other parameters to ensure the stability and reliability of the welding quality. The automated control system can also achieve efficient production rhythm and precise welding operations, improving production efficiency and welding quality. This seam welding machine through mechanization and automation, efficient completion of the square pile steel skeleton welding work, for construction engineering and other fields to provide high-quality steel skeleton products.