Butt welded flange, also known as split flange, is a kind of flange The flange is the part connecting the pipe to the end of the pipe Bolts with holes on the flanges make the two flanges connect tightly And butt welded flanges of fasteners are collectively referred to as flange joints Flanges are an essential part of equipment and equipment parts, and also an essential part of pipeline design and pipe fittings and valves At present these production stainless steel flange factory site too many too scattered this kind of non-centralized way appears in the social production because the management is very inconvenient results lead to the product quality is not up to standard therefore the qualified product is required certain technical content Let's talk about the production and processing process of butt welded flange

Butt welded flange is not easy to deform, has good sealing performance and is It is suitable for pipes with large pressure or temperature fluctuation or pipes with high temperature, high pressure and low temperature The advantage is that the price is relatively cheap and the nominal pressure is less than 2.5 MPa It is also used in pipelines for conveying expensive flammable and explosive media with a nominal pressure of about PN 16MPa Butt welded flanges are easy to connect and use and can withstand great pressure Butt welding flange pads are made of different materials according to different pressure grades From low pressure asbestos pad to high pressure asbestos pad to metal pad

Production and processing process of butt welded flange:

1. Whether the annealing temperature reaches the specified temperature Butt welded flange generally adopts solution heat treatment commonly known as "annealing" Temperature range is 1040 ~ 1120 (Japanese standard) It can also be observed through the observation hole of the annealing furnace Flange fittings in annealed areas should be incandescent but free from softening and sag

2. Treat water vapor of butt welded flange in casting furnace On the one hand, it is necessary to check whether the burden is dry or not; Second, whether there are too many water stains in the flange pipe fittings entering the furnace, especially if there are holes in the flange pipe fittings, don't leak in or it will completely destroy the furnace atmosphere

3. Sealing of furnace body Bright annealing furnace for butt welding flange should be closed and isolated from outside air; Open only one vent when using hydrogen as protective gas (for igniting the discharged hydrogen) The inspection method can be smeared with soapy water at the joint of annealing furnace to see if it runs; One of the places where air leaks easily is the place where the annealing furnace enters and exits the pipe The sealing ring in this place is particularly easy to wear and tear, so check and replace it frequently

STEP 4 Protect gas pressure In order to prevent micro-leakage of butt welded flange, the protective gas in the furnace should keep a certain positive pressure If it is hydrogen protective gas, it is generally required to be above 20kBar

5. Annealing atmosphere The annealing atmosphere of butt welded flange is generally pure hydrogen atmosphere with purity better than 99.99% If another part of the atmosphere is inert gas, the purity can be lower, but it must not contain too much oxygen and water vapor