Welding plugs are used to block holes by welding, without the need for adhesive bonding, achieving water tightness and beautiful appearance, and easy to operate. There are four types of plugs: square plugs, hexagonal plugs, and round plugs. The implementation standards include ANSIB16.11, GB/T14383, and BS3799 plugs, also known as pipe caps, caps, pipe covers, and plugs. They are fittings installed on the external threads of the pipe end to cover and plug the pipe. Used to seal pipelines, with the same function as pipe plugs, it can be directly screwed onto pipes without the need for other fittings. The design of plugs includes convex plugs, conical shells, variable diameter sections, flat covers, and compression ports