Flat welding flange is a flange with simple structure, which is connected with the vessel or pipeline through fillet weld. Butt welding flange is neck type, with better relative stiffness and sealing. In practical application, the two can be selected according to different situations, such as pressure size, pipe style, etc. Their differences are mainly reflected in the following points.

Non standard flat welding flange

Flat welding flange is not necked, while butt welding flange is necked. Therefore, if the pressure is not high, flat welding flange can be considered; On the contrary, butt welding flange is recommended.

Flat welding flanges are generally welded on one side, while butt welding flanges need to be welded on both sides, so the former is generally used for low and medium pressure pipelines, while the latter is medium and high pressure pipelines.

The pipe of flat welding flange is inserted inside, and the welding performance of butt welding flange is relatively good. Flat welding flange and butt welding flange shall be selected according to actual conditions in actual use.

weld neck flanges

When looking for manufacturers, you should look for those who have complete models. Haihao Group specializes in the production of forged flanges, steel pipes, pipe fittings, elbows and other pipeline engineering supporting products. We can recommend appropriate products according to your needs. Welcome to consult and cooperate!