... of the steel ring to form the cylinder. Shall not be directly machined into steel with a neck welded flange ... ; 3, the ring butt weld should be used full penetration weld; 4, the ring butt ... weld should be post-weld heat treatment, and for 100% ray ... prone to leakage. High-quality products Welded neck flange not easy to distortion, good sealing, widely used, ...