Cylindrical head welding studs are a type of high-strength rigid connection fastener used in arc stud welding, primarily for large public buildings and increasingly for super high-rise buildings. Their main structure is often made of reinforced concrete. To ensure good bonding between steel components and to work together, cylindrical head welding studs have gained widespread use in this field through numerous experiments and engineering applications. They are used in industrial plant construction, highways, railways, bridges, towers, automobiles, energy, transportation facilities, airports, stations, power plants, pipe supports, lifting machinery, and various other steel structure projects.

Stud welding is a method where one end of the stud is in contact with the surface of a plate (or pipe), an electric arc is struck, and after the contact surface melts, pressure is applied to the stud to complete the welding. Arc stud welding with cylindrical head welding studs is suitable for high-rise steel frame structures, industrial buildings, highways, railways, bridges, towers, automobiles, energy, transportation facilities, airports, stations, power plants, pipe supports, lifting machinery, and other steel structures.

Welding studs or cylindrical metals are placed on the welding base material. The welding stud is lifted while conducting current, generating an arc between the welding stud and the welding base material. The arc melts the end of the welding stud and the surface of the welding base material, forming a welding pool. The welding stud moves relative to the welding base material, being controlled to insert into the pool at a certain speed. The welding current is terminated, the arc extinguishes, and the pool solidifies, completing the welding process and forming a fully fused weld.

This utility model relates to the technical field of stud welding machines, particularly to a special nozzle for welding U-shaped anchor nails, which includes a conductive connecting rod. A limiting column is fixed near the end of the connecting rod, and the limiting column is perpendicular to the central axis of the connecting rod. A spring is fitted on the limiting column, and a pressure plate is passed through it. The spring is used to press against the pressure plate, which is used to press the U-shaped anchor nail, and the limiting column can pass through the slot of the U-shaped anchor nail.