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Advantages and disadvantages of socket welding flange and butt welding

2021-09-06 11:32:20   COMMENT:0 HITS:
Socket welding flange is usually used for small pipes with diameter less than Dn40 and is more economical. Butt welding is usually used for parts above Dn40. Socket welding is the process of first inserting the socket and then welding (for example, there is a flange called socket flange, which is a projection welding flange, which is the connection when connected to other parts (such as valves). The connection form of butt welding flange and pipeline welding. Socket welding is usually to insert the pipeline into the flange and weld. Butt welding is to use butt welding flange to weld the pipeline to the butt surface.
Although X-ray inspection is not possible, butt welding is acceptable for butt welding. Therefore, it is recommended to use butt welding flange to improve the requirements of welding inspection
Butt welding usually requires higher requirements than socket welding and post welding. The quality is also good, but the detection means are relatively strict. Butt welding requires X-ray inspection. Socket welding can be used for magnetic particles or permeability test (carbon powder, penetrating carbon steel) such as stainless steel). If the fluid in the pipeline does not have high requirements for welding, socket welding is recommended. The connection types to be tested are mainly small-diameter valves and pipes, which are used for pipe joint and pipe welding, Small diameter pipes usually have thin walls, are prone to edge dislocation and ablation, and are difficult to butt weld. They are suitable for socket welding and socket.
Welded socket is often used under high pressure due to its reinforcement, but socket welding also has disadvantages. One is that the stress condition after welding is not good and it is difficult to melt completely. The trend is that there are gaps in the pipeline system, so it is not suitable for crevice corrosion sensitive media and pipeline systems with high cleanliness requirements; Use socket welding; And ultra-high pressure pipes. Even in small diameter pipes, it has large wall thickness, and socket welding can be avoided as much as possible by butt welding.

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