Weld Neck Flange

Weld neck (WN) flanges offer key benefits for industrial piping:

  1. Enhanced strength/stiffness: The integrated neck design reduces stress concentration, boosting rigidity and load-bearing capacity for high-pressure/temperature conditions.

  2. Superior sealing: Butt-welded joints (away from the sealing face) minimize deformation risks, ensuring reliable, long-term sealing.

  3. Durability: Resists fatigue, vibration, and pressure fluctuations, suiting harsh, critical applications (e.g., petrochemical, power sectors).

  4. Quality welds: Butt-weld connections enable strong, inspectable joints for permanent, high-reliability systems.


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Product Details
A weld neck (WN) flange is an industrial piping fitting, consisting of a circular bolt-hole disc and an integrated tapered neck. Key details:

  • Structure: Smoothly transitioning neck (wall thickness matches pipes) + sealed face (e.g., RF, FF) + bolt holes for assembly.

  • Connection: Joins pipes via butt welding (groove weld), with welds positioned away from the seal.

  • Materials: Common options: carbon steel (A105), stainless steel (304/316), alloy steel (per pressure/temperature/corrosion needs).

  • Standards: Complies with ASME B16.5, EN 1092-1, GB/T 9115, etc.

  • Use Cases: Critical systems (high-pressure oil/gas lines, power plant steam pipes, pressure vessels) in petrochemical, energy industries.


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