"Flat welding" in the name of Stainless Steel Flange represents the welding form of the flange, which is different from the butt welding flange because the shape and size of the flange are different due to different welding forms, and the occasions of use and the pressure they bear are also different.

The weld of the flat welding flange cannot pass the radiation detection, but the weld of the welding flange can. The weld of the pipe with the neck flat welding flange and the flange is in the form of a fillet weld, and the weld of the neck butt welding flange and the pipe is in the form of a circumferential butt weld.

Flat welding has a boss similar to the butt weld, a groove is formed on the boss, and the pipe is welded inside. Sleeve welding means that there is no boss, and the groove is opened directly on the flange body, just like opening a hole in a blind flange, and then the groove is opened.

Compared with the butt welding flange, the flat welding flange has a simple structure and saves materials, but the rigidity and sealing are not as good as the neck welding flange. Flat welding flanges are widely used in the connection of medium and low pressure containers and pipelines.

The sealing surface of the flat welding flange is generally divided into two types: one is called the FF surface, which is a full-plane flange. Let's put it this way, this flange is like a disc with a hole in the middle and corresponding bolt holes around it. This is called a full-plane flange.