Neck welding flange refers to a type of flange with a tapered neck that is butt welded to the cylinder or pipeline. It belongs to integral flange.

Due to the transition structure and butt welding connection of the tapered neck, the strength and stiffness of the flange are strengthened, and the sealing performance is better than that of the flat welding flange. The disadvantage is that it requires forging for manufacturing, consumes a lot of materials, and incurs high manufacturing costs. Suitable for situations with high pressure, temperature, or high sealing requirements.