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Forged Welding Neck flange refers to a flange with a cone neck and butt welded with a cylinder or pipe. It belongs to the integral flange. Due to the excessive structure of the cone neck and the butt welding connection, the strength and stiffness of the flange are strengthened, the butt welding flange is not easy to deform, the seal is good, and the application is widely.
The sealing surface forms are: sudden surface (RF), concave surface (FM), convex surface (M), tenon surface (T), groove surface (G), full plane (FF), Ring connection surface (RJ).
Production Process
Neck butt welding flange in the actual production and development of different ways and processes for production and production, according to the way and principle of the process, can produce important value and effect on different aspects, in the actual production to add certain elements, thereby increasing the characteristics and value of carbon steel flange, good performance of the use of characteristics and value.
1. Bend: bend the billet to a certain Angle or shape.
2. Twist: make one part of the blank rotate at a certain Angle relative to another part.
3. Punching: Use the punch to flush out through holes or through holes on the blank.
4. Upsetting: Upsetting is the operation process of forging the original blank along the axis to reduce its height and increase its cross section. This process is often used for forging gear billets and other disc-shaped forgings. There are two kinds of upsetting: full upsetting and partial upsetting.
5. Drawing length: Drawing length is the forging process that increases the length of the billet and reduces the cross-section, which is usually used to produce shaft parts blank, such as lathe spindle, connecting rod, etc.
6. Cutting: cut the blank or cut the head.
Purpose
Forged welding neck flange is not easy to deform, sealed well, widely used, has the corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition, the welding distance from the joint surface is large, the joint surface is free from welding temperature deformation, it takes a more complex horn shape structure, suitable for pressure or temperature fluctuations of the pipeline or high temperature, high pressure and low temperature pipeline, Generally used for PN greater than 2.5MPa pipe and valve connection; It is also used for transporting expensive, flammable and explosive media on pipelines.
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