This series of automatic pipe welding machines are mainly used for automatic welding of various on-site and prefabricated pipes. The applicable pipe diameter is above 114mm, and the wall thickness needs to be greater than 5mm before automatic filling and capping work. This equipment adopts the pipe fixing, and the equipment is adsorbed on the pipe or the customized track through the permanent magnet wheel for automatic welding. The welding efficiency is high, the forming is stable, and the welding quality is guaranteed. During welding, the welding head crawls on the pipe, and the pipe does not need to be rotated or moved, and the welding head can realize automatic welding. During the welding process, the operator can fine-tune the welding process of the equipment through the wireless remote control, so as to ensure the welding quality.