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Simple analysis of the difference between butt welding flange and flat welding
Release time:
2022-04-22 11:27
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Simple analysis of the difference between butt welding flange and flat welding.
The butt welding flange is that the pipe diameter and wall thickness of the interface end are the same as the pipes to be welded, and are welded like two pipes.
The flat welding flange is a concave table that is slightly larger than the outer diameter of the pipe at the interface, and the pipe is inserted and welded inside.
Butt welding has better welding performance and less corrosion.
Flat welding and butt welding are the welding methods when flanges and pipes are connected. When welding flat welding flanges, only single-sided welding is required, and there is no need to weld the inner port of the pipe and flange connection. The welding installation of butt welding flanges requires double flanges. face welding.
Therefore, flat welding flanges are generally used for low and medium pressure pipelines, and butt welding flanges are used for the connection of medium and high pressure pipelines. Butt welding flanges are generally at least PN2.5MPa. Butt welding is used to reduce stress concentration. Butt welding flanges are mostly neck flanges, also called nipple flanges.
Therefore, the installation cost, labor cost and auxiliary material cost of the butt welding flange are higher, because there is one more process.
Not all butt welding flanges need to be welded on both sides of the inner and outer sides. If there are no special requirements, they are generally only welded on the outside.
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