Olet of socket welding is a type of branch pipe platform, which is mainly used to replace the traditional branch pipe connection methods such as reducing tees, reinforcing plates and reinforced pipe sections. It has outstanding advantages such as safety and reliability, reduced cost, simple construction, improved medium flow path, series standardization, and convenient design and selection. It is especially widely used in high-pressure, high-temperature, large-diameter, thick-walled pipelines, and is suitable for various industrial pipeline systems.