Spiral steel pipe is a spiral seam steel pipe made from strip steel coil as raw material, often formed by warm extrusion, and welded by automatic double wire double-sided submerged arc welding process. The raw materials for spiral steel pipes include steel coils, welding wires, and flux. Strict physical and chemical testing must be conducted before investment. The butt joint of the steel strip head and tail adopts single wire or double wire submerged arc welding, and automatic submerged arc welding repair welding is used after rolling into the steel pipe.