WN Flange is a kind of flanged pipe fittings in flanges. It can be numbered in a certain way and method, produced and used according to certain standards, and can play an important role and value in different fields and industries, ensuring that it can be used in use. Play an important role and contribution. The flanges are sealed with gaskets.

　　1. The welding seam method is different: the flat welding seam cannot be radiographically inspected, but the WN Flange seam can. The welding seam method of the pipe and flange with neck flat welding flange is fillet weld, and the welding seam method of WN Flange and pipe is girth weld; flat welding is two fillet girth welds, butt welding is one Butt girth welds.

　　The difference between the flat welding flange with neck and the flat welding flange without neck is that the flat welding flange with neck is one more place in the pipeline welding part than the flat welding flange without neck. The flange is also a flat flange, and the boss without flange is also a flat fillet weld. The weld between the WN Flange and the receiving joint is a Class B seam, and the welding seam between the neck flange and the receiving joint is a Class C seam, and the non-destructive testing after welding is different.

　　2. Different nominal pressures: The nominal pressure of the flat neck flange is: 0.6---4.0MPa, while the nominal pressure of the WN Flange is: 1--25MPa, obviously, the flat neck flange Adapt to lower pressure levels.

　　3. Different connection methods: The difference in structure between the necked flat welding flange and the WN Flange lies in the difference in the connection method between the receiving and the flange. The flange is butted with the receiver.