Welded flange has the corresponding rigid and elastic requirements and reasonable butt welding thinning transition, the solder joint from the joint surface of large distance, the joint surface from welding temperature deformation, it takes a more complex mouthhorn shape structure.  

Suitable for the pressure or temperature greatly fluctuated pipeline or high temperature, high pressure and low temperature pipeline, generally used for PN > 2.5mpa pipeline and valve connection;  Also used to transport expensive, flammable, explosive medium pipeline.  

Butt welding flange is a kind of pipe fitting, which refers to the flange with a neck and a pipe transition and butt welding connection with the pipe.  Butt welding flange is not easy to deformation, good sealing, widely used, there are corresponding rigid and elastic requirements and reasonable butt welding thin transition, welding from the joint surface interval is large, the joint surface from welding temperature deformation.