Socket welding or threaded latrolet and elbolet are reinforced pipe fittings used for branch pipe connections. They have the advantages of safety, reliability, reduced cost, and simple construction. They are increasingly used especially in high-pressure, high-temperature, large-diameter, and thick-walled pipelines. High-quality forgings are used, and the materials used are the same as the pipe materials, including carbon steel, alloy steel, stainless steel, etc. The branch pipes and main pipes are all welded. The connections between the branch pipe platform and branch pipes or other pipes (such as short pipes, wire plugs, etc.), instruments, and valves include butt welding, socket welding, threads, etc.