Flange ANSI B16.47 Welded Neck Flange ASME B16.5

Advantages and disadvantages of socket welding flange and butt welding:

Socket welding is usually used for small pipes smaller than DN40 in diameter and is more economical. Butt welding is usually used for parts above DN40. Socket welding is the process of first inserting a socket and then welding (for example, there is a type of flange called a socket flange, which is a projection weld flange, which is a connection when connecting to other parts such as a valve. Butt welding method The connection form of flange and pipe welding, socket welding is usually the pipe is inserted into the flange and welded, butt welding is the use of butt welding flange to weld the pipe to the butt surface. Although X-ray inspection is not possible, butt welding can accept butt welding welding, so it is recommended to use butt welding flanges to improve the requirements of welding inspection

Butt welds are generally more demanding than socket welds and post welds. The quality is also good, but the detection method is more stringent, butt welding requires X-ray inspection, socket welding can be used for magnetic particle or permeability testing (carbon powder, penetrating carbon steel such as stainless steel), if the fluid in the pipeline is not suitable for welding The requirements are not high, socket welding is recommended, and the connection types that are convenient for detection are mainly small-diameter valves and pipes, which are used for pipe joints and pipe welding. Small-diameter pipes usually have thin walls, which are prone to edge dislocation and ablation, and are difficult to Butt welding, suitable for socket welds and sockets.

Welded sockets are often used under high pressure due to their reinforcing effect, but socket welding also has disadvantages. One is that the stress state after welding is not good, and it is difficult to completely melt. Trends are: piping systems with gaps and therefore unsuitable for crevice corrosion-sensitive media and piping systems with high cleanliness requirements; the use of socket welds; and ultra-high pressure piping. Large wall thicknesses are available even in small diameter pipes, and socket welds can be avoided as much as possible by butt welding.

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