B16.5 Aluminum material flange

Aluminum 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.