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Flange Welding Neck ANSI Weld Neck Lap Joint Flat Welding Long Neck Flange. Long tapered hub relieves stress concentration, strong anti-fatigue for thermal cycling service. Full penetration butt weld structure, zero leakage for high-pressure hazardous medium. One-piece forging, multiple alloy material options for anti-corrosion harsh environments. Long neck design simplifies welding and full NDT inspection of weld joints. Wide pressure rating Class150-2500, ideal for vessel nozzle & critical pipeline. Compliant with global industrial standards, customizable size, face type and neck heightSize.