Welding Neck Flange

The welding neck flange is also called butt-welded flange. It is different from the flat-welded flange in that there is a long and inclined high neck from the welding place of the flange and the pipe to the flange, and the wall thickness of this section of high neck .The gradual transition to the thickness of the pipe wall along the height direction improves the stress discontinuity, thus increasing the flange strength.


Welding neck flanges are mainly used in harsh working conditions, such as pipeline thermal expansion or other loads that cause large stresses on the flange or repeated stress changes, pipelines with high pressure and temperature fluctuations, or high temperature, high pressure and Sub-zero temperature pipeline. The welding neck flange is not easy to deform, has good sealing, and is widely used. The nominal pressure is about PN1.0MPa ~ PN25.0MPa.


Welding neck flanges can be divided into flat welding neck flanges, raised welding neck flanges, convex-convex welding neck flanges, tongue-and-groove welding neck flanges, ring-connected welding neck flanges according to the types of sealing surfaces.

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