Flanged fittings is a welded pipe fittings. Such fittings and piping is used to match. There are processed, there are no processing. Some castings, is the whole cast together out of the flange. The welding is a post-processing. Factories can be processed at the construction site can be processed. The size of the head pipe flanges, there are elbows, tees flange fittings. The material is also diverse, carbon steel, alloy steel, stainless steel. 1. Flange (Flange) also known as the flange or flange plate. Tube and pipe flanges are interconnected parts, connected to the pipe end. There are holes on the flange, so that the two flange bolts tightly connected. Between the flange sealing gasket. Threaded flange connection points (wire connected) flange and welding flange. 2. The tube conduit connected parts. Socket connection methods can be divided according to type fittings, threaded fittings, flanges and welded pipe fittings four categories. Multi-tube made of the same material. There elbow (elbow), flanges, tees, crosses tube (crosshead) and diameter pipe (size of the head) and so on. Elbow for tubes turn the place; for tube and pipe flanges interconnected parts, connected to the pipe end, tee collection tube for three places; Stone tube collection tubes for four places; different diameter pipe for the two pipes are connected with different diameters places.