The head is suitable for automatic welding of tubes/pipes in narrow pitch form. It can weld various pipes/pipes such as carbon steel and stainless steel. The diameter of the tube ranges from φ32mm-38mm, and two methods of filling wire or self-melting can be selected. The arc length can be adjusted automatically, and it has a yaw function. It can precisely realize orbital TIG tube/tube welding, with high reproducibility of welding results and ideal welding results. Mainly used in chemical, food, boiler, military and nuclear power industries.