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Weld Neck Flange
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Weld Neck Flange

The butt welding flange is not easy to deform, has good sealing, and is widely used. It has corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition. The distance between the welding port and the joint surface is large, and the joint surface is protected from welding temperature deformation. The horn-shaped body structure is suitable for pipelines with large fluctuations in pressure or temperature or high temperature, high pressure and low temperature pipelines. It is generally used for the connection of pipelines and valves with a PN greater than 2.5MPa; it is also used for transporting expensive, flammable and explosive On the pipeline of the medium.
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1. The level of butt welding flange and its technical requirements should meet the corresponding requirements of JB4726-4728. 1. Forgings of carbon steel and austenitic stainless steel with a nominal pressure of PN of 0.25MP-1.0MPa are allowed to use Grade I forgings. 2. In addition to the following regulations, forgings with a nominal pressure PN of 1.6MPa-6.3MPa should meet the requirements for forgings of Grade II or above. 3. Those who meet one of the following conditions shall meet the requirements of Ⅲ and forgings:  (1) Forgings for flanges with nominal pressure PN≥10.0MPa;  (2) Chrome-molybdenum steel forgings with nominal pressure PN>4.0MPa;  (3) Nominal Ferritic steel forgings with pressure PN>1.6MPa and working temperature ≤-20 degrees Celsius.

2. Butt-welding flanges are generally made by forging or forging-rolling technology. When steel plate or section steel is used, the following requirements must be met:  1, butt-welded flanges should be ultrasonically inspected and no delamination defects;  2, they should be cut into strips along the rolling direction of the steel, and then bent and butt-welded into a ring , And make the surface of the steel form a cylindrical surface of the ring. The steel plate shall not be directly machined into a butt-welded flange with neck;  3, the butt weld of the ring shall be a full penetration weld;  4, the butt weld of the ring shall be subjected to post-weld heat treatment, and 100% radiographic or Ultrasonic flaw detection, and radiographic flaw detection meets the level II requirements of JB4730, and ultrasonic flaw detection meets the level I requirements of JB4730.

3. The outer slope of the neck of the butt-welded flange should not be greater than 70°. Welding flanges strictly control technical parameters during production and welding to ensure that they can give full play to their role and value in production and use.


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