Understanding the Classification and Process Characteristics of Weld-Neck Flanges

Process Characteristics

1. Butt Welding Connection
   • The tapered neck reduces stress concentration and improves fatigue resistance.
   • Ensures alignment between pipe and flange, minimizing turbulence.
2. Material Matching
   • Flange material is usually the same as the pipe material to ensure weld quality and mechanical compatibility.
3. High Strength Capability
   • Withstands pressures from PN16 up to PN64 or Class 150 to Class 2500 in ASME standards.
4. Precision Machining
   • Requires accurate beveling of the neck and smooth sealing face to ensure gasket placement and sealing reliability.
5. Application in Harsh Conditions
   • Commonly used in high temperature, high pressure, or corrosive environments due to strong structural integrity.