Usually furnished in smaller nominal pipe sizes, these make an excellent alternative to weld necks and slip-ons when necessary. An assembly with limited space may be an instance in which a socket weld is selected, provided the pressure class is comparatively low and the fluid is not corrosive or for extremely high temperature service.

These socket flanges connect to square end pipe with a fillet weld at the ID of the hub of the socket, as the pipe is designed to sit almost flush against the counter bore of the flange. The expansion gap between the end of the pipe and the counter bore leaves just enough space for the welder to adjust the pipe within the connection. It is important to note that a butt weld pipe connection is not recommended for suiting to a socket counter bore connection when a square end pipe connection is possible.

The inner bore of the slip on flange is a little larger than the pipe OD,to make sure the pipe or fitting end can slip into the flange.The slip on flange is fillet welded with the pipe or fitting,different with the butt welding method of weld neck flange, and the pipe no need to do the bevel end,just square end is ok for welding,this is also different.Commonly,the slip on flange can be fillet welded with the pipe on the two sides.It can make sure the joint quality with the pipe.

The advantage of socket weld flanges is their simple design, they are well suited for small pipe size applications e.g. 2 inches (5cm) and below, and for non-critical applications e.g. non-hazardous systems; they are not suitable for highly erosive or corrosive systems.

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