Butt welding flange is not easy to deform, sealed well, widely used, has the corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition, the welding distance from the joint surface is large, the joint surface is free from welding temperature deformation, it takes a more complex horn shape structure, suitable for pressure or temperature fluctuations of the pipeline or high temperature, high pressure and low temperature pipeline, Generally used for PN greater than 2.5MPa pipe and valve connection; It is also used for transporting expensive, flammable and explosive media on pipelines.
Butt welded flange is generally made by forging or forging rolling process. When the steel plate or section steel is used, the following requirements must be met: 1, welding flange should be ultrasonic detection, no delamination defects; 2. It should be cut into strips along the rolling direction of the steel, bent and welded into a ring, and make the surface of the steel form a cylinder of the ring.
The steel plate shall not be machined directly into a neck butt welding flange; 3, the butt weld of the ring should adopt full penetration weld; 4. The butt weld of the ring shall be subjected to post-welding heat treatment, and be subjected to 100% ray or ultrasonic inspection, and X-ray inspection shall meet the II requirements of JB4730, and ultrasonic inspection shall meet the I requirements of JB4730.
The outer inclination of the neck of the butt welded flange should not be greater than 70°. The technical parameters of butt welded flange are strictly controlled during production and welding to ensure that they can fully play their role and value in production and use.
Submitted successfully
We will contact you as soon as possible
Submitted successfully
We will contact you as soon as possible
العربية
Русский
日本語
Italiano
