Carbon steel flat welding flange refers to a type of flange that is connected to a container or pipeline using a fillet weld. It belongs to any type of flange. During design, based on the integrity of the connection between the flange ring and the straight tube section, it shall be checked as either an integral or loose flange. There are two types of flange rings: with and without a neck. Compared with the neck welded flange, the flat welded flange has a simple structure and saves materials, but its stiffness and sealing are not as good as the neck welded flange. Widely used for connecting medium and low pressure vessels and pipelines. Carbon steel flat welding flanges are suitable for pipeline systems with relatively low pressure levels and minimal pressure fluctuations, vibrations, and vibrations.