A Weld Neck Flange is a type of flange used in piping systems to connect pipes, valves, and other equipment. It features a long neck that allows for a smooth transition between the flange and the pipe, which helps to reduce stress concentrations. This design makes it suitable for high-pressure and high-temperature applications. These flanges are typically made from materials like carbon steel, stainless steel, or alloy steel, and they are welded to the pipe for a strong, leak-proof connection. The weld neck flange is often used in industries such as oil and gas, chemical processing, and power generation.