Requirements For Butt Welding Flange Manufacturing

Welding flanges are generally made by forging or forging and rolling. When steel plate or section steel is used, the following requirements must be met:

1. Butt-welded flanges should be ultrasonically inspected, and there should be no delamination defects;

2. It should be cut into strips along the rolling direction of the steel, and then be bent and butt welded into a ring, and the surface of the steel should be formed into a cylindrical surface of the ring. The steel plate shall not be directly machined into a butt-welded flange with neck;　　

3. The butt weld of the ring shall adopt full penetration weld;

4. The butt weld of the ring should be subjected to post-weld heat treatment and 100% radiographic or ultrasonic inspection. The radiographic inspection meets the requirements of Class II of JB4730 and the ultrasonic inspection meets the requirements of Class I of JB4730.