What are the application technologies of welding flanges?
3, the ring should be used in full penetration weld butt weld; 4, the ring should be post weld heat treatment, and 100% X-ray or ultrasonic inspection and radiographic inspection conforms to the II class JB4730 requirements, ultrasonic detection with JB4730 I request. Three. The outer slope of the neck of the butt weld flange shall not be greater than 7O. The welding flange strictly controls the technical parameters during production and welding, and ensures the full function and value of the welding flange in production and use.
Two. The welding flanges are usually made of forging or forging. When made of steel or shaped steel, the following requirements must be met:1, welding flange should be ultrasonic testing, no delamination defects; 2, should be rolled along the direction of steel cutting into strips, bent by welding into a ring, and make steel surface forming ring cylinder. The steel plate directly machined into the butt welding neck flange butt weld shall not;
First, the level of welding flanges and their technical requirements shall comply with the corresponding requirements of JB4726-4728. 1, nominal pressure PN for 0.25MP-1.0MPa carbon steel, austenitic stainless steel forgings, allowing the use of grade I forgings. 2, in addition to the following provisions, the nominal pressure of PN 1.6MPa-6.3MPa forgings shall meet the requirements of secondary or secondary forgings. 3, in line with one of the following conditions, and shall comply with the requirements of forging III: (1) PN = 10.0MPa nominal pressure flange forgings; (2) the nominal pressure PN>4.0MPa chrome molybdenum steel forgings; (3) PN>1.6MPa nominal pressure and the working temperature is less than or equal to -20 degrees Celsius ferritic steel forgings.
