Welding Neck Flange

HIGH STRENGTH & RIGIDITY: The long neck design of the welding neck flanges provides extra support and strength, enabling them to withstand greater pressure and loads.
Good sealing performance: as the weld seam between the flange and the pipe is located on both the inner and outer sides of the flange, it can provide better sealing effect and reduce the risk of leakage.
Wide range of uses: Butt-weld flanges are suitable for harsh working environments such as high pressure, high temperature, and corrosive media, and can meet the needs of various industrial fields.
Easy to inspect and maintain: Since the weld is on the outside of the flange, it can be easily inspected by non-destructive testing methods such as radiography to ensure the quality of the weld. Meanwhile, due to its relatively simple structure, it is also easy to carry out maintenance and replacement.

Technical drawing for welding neck flange conforming to ASME B16.5 Class 150, raised face (RF).

Machine bolt with nuts and stud bolt with nuts for the bolting of ASME B16.5 flanges.

Welded neck flanges are widely used in petrochemical, electric power, nuclear energy and other industrial fields that require high pressure and high temperature connections. In these fields, piping systems are subjected to extremely high pressures and temperatures, and therefore require the use of high-quality, high-strength connections to ensure the safe operation of the system. Welded neck flanges are an ideal choice to meet these needs.

Pre-installation check: Before installing the welding neck flange, you need to carefully check whether the specifications and materials of the flange and the pipe are the same, in order to avoid any mismatch. At the same time, it is necessary to ensure that the flange neck matches the outer diameter of the pipe to ensure smooth welding.
Cleaning of welding groove: Before welding, the oil, oxide and other impurities on the surface of the welding groove must be cleaned to ensure the welding quality. This helps to reduce welding defects and improve welding strength and sealing performance.
Correct welding application: Welding should be carried out according to the requirements of the welding process, and pay attention to parameters such as welding current, voltage, speed, etc. This ensures the quality of the weld and reduces the defects that may occur during the welding process.
Regular inspection and maintenance: During use, the butt welding flange should be inspected and maintained regularly. For example, check the weld for cracks, corrosion and other problems, and repair them in time. At the same time, it is also necessary to pay attention to the antirust and anticorrosion treatment of the flange in order to extend its service life.