Other name: head, block, cap, tube cover and head. Purpose: pipe fittings that are welded to the pipe end or outside of the pipe end to cover the pipe. Used to seal the pipeline, the function is the same as the pipe. The form of the blind plate is close, except that the blind plate can be disassembled and the welding cap is not disassembled.

Head is a component of the container, according to the geometry of the different can be divided into spherical or oval, dish, QiuGuanXing, conical shell cover and so on several kinds of peace, spherical and elliptic type, disc, ball crown head is referred to as convex head. The welding is divided into welding heads and socket welding heads. Used for various container equipment, such as tank, heat exchanger, tower, reaction kettle, boiler and separation equipment. The material is made of carbon steel (A3, 20 #, Q235, Q235, Q345B, 16MN, etc.), stainless steel (304, 321, 304L, 316, etc.), alloy steel (15Mo3 15CrMoV 35CrMoV 45CrMo), aluminum, titanium, copper, nickel and nickel alloy etc.