Welding neck flanges are flanges that designed to be joined to a piping system by butt welding. The weld neck flange is relatively expensive because of its long neck, butt is prefereed for high stress applications. The neck, or hub, transmits stresses to the pipe, reducing stress concentrations at the base of the welding neck flange. The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides importamt reinforcement of the weld neck flange. The bore of the weld neck matches the bore of the pipe, reducing trubulence and erosion.

The industrial process come into die forging and machining, we can provide a wide range of flanges, following on standards like ASME B16.5 flange, ASME B16.47 A&B flange, DIN2631 welding neck flange, JIS 5K SOP and 10K SOH flange. ASME flange include B16.5, B16.47 A&B flange, this standard system include slip on flange, blind flange, welded neck flange, lapped joint flange ( loose flange), socket welded flange, B16.36 orifice flange, long weld neck flange, and special flange, size from 1/2 inch to 60 inch, class 150-class 2500.