Stainless steel products can be seen everywhere in life Because of this, we know a lot about stainless steel For example, stainless steel products are not easy to rust, stainless steel products are more durable and so on When it comes to stainless steel butt welded flange, many people will think this kind of thing is very strange. After all, this kind of thing is not commonly used by ordinary people in our life In fact, stainless steel butt welded flange is of great use in production and life

The following stainless steel manufacturers introduce the precautions when using stainless steel welded flanges

1. The current passing through butt welded flange welding technology should not be too large Generally, it should be less than 20% of the welding strip, and then the arc should not be too long during operation Narrow bead technology can be used for rapid interlayer cooling As long as the above situation is avoided, the corrosion of stainless steel welded flange will be avoided

2. The electrode used needs to be kept dry. If necessary, it can be dried to make the electrode in a dry state But here, stainless steel flange manufacturers should remind that the drying method can not be used repeatedly, that is, it is necessary to keep the evenness to avoid peeling

3. Stainless steel flange manufacturers should emphasize that the hardenability of chromium stainless steel will have a relatively large American standard after butt welding, which is easy to produce cracks If the same type of electrode is used for welding, the preliminary work needs to be preheated before cold treatment to ensure the normal use of butt welded flange

The main differences between butt welded flange and flat welded flange are as follows:

1. Different forms of welds: Plane welds can not be tested by radiography, but butt welds can The weld between pipe and flange with neck flat welded flange is fillet weld and the weld between pipe and neck flat welded flange is circumferential weld Flat weld is two fillet girth weld butt weld is one butt girth weld Flat welded flange with neck and flange without neck are different in that flange with neck has one more position in pipe welding than flange without neck Flat welded flanges without necks are flat welded flanges. Bosses without flanges are also fillet welded The weld between neck welded flange and nozzle belongs to Class B weld while the weld between neck welded flange and nozzle belongs to Class C weld, so post-weld nondestructive testing is different 2. Different materials: Flat welded flanges with necks are processed from ordinary steel plates with required thickness. Welded flanges with necks are mostly processed from forged steel

3. Nominal pressure difference: Nominal pressure of neck welded flange is 0.6-4.0 MPa Nominal pressure of neck welded flange is 1-25mpa It is obvious that the pressure rating of neck flat welded flange is low

4. Different connection modes: The structure difference between the flange with neck and the flange with neck is that the connection modes between the nozzle and the flange are different Generally, the necked flange is the corner joint between the nozzle and the flange. The necked flange is the butt joint between the flange and the nozzle