Weld neck pipe flanges attach to the pipe by welding the pipe to the neck of the pipe flange. The allows for the transfer of stress from the weld neck pipe flanges to the pipe itself. This also reduces high stress concentration at the base of the hub of the weld neck pipe flanges. Weld neck pipe flanges are often used for high pressure applications. The inside diameter of a weld neck pipe flange is machined to match the inside diameter of the pipe.

These are stainless steel weld neck (WN) flanges, featuring a long, tapered neck that integrates with the pipeline via butt welding. The neck design ensures uniform stress distribution, making them ideal for high-pressure, high-temperature, and corrosive environments. Widely used in oil & gas, chemical, pharmaceutical, and power industry pipelines requiring long-term reliability.