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Welding technology:1. Tack weldingTack welding must be carried out by welders with corresponding qualification certificates. The surface and both sides of the base metal near the weld shall be uniform and smooth without burr, crack, oxide scale, rust, grease, water and other impurities.The thickness
Neck flange, also known as long neck flange and neck flange, is a disc-shaped part, which is mainly used to realize the connection between pipelines. It has been widely used in petrochemical, urban water supply and power system. In recent years, with the planning and construction of UHV transmission
