You have created your custom Pipe, Elbow and Flange you want to publish in the Content Center Library and use for creating a Flanged Tube & Pipe Style.
The procedure below shows the End Treatments settings to be used when you make the Authoring of these components before publishing them.
For the pipe and the elbow, the End Treatments should be Welded.
For the flange, one of the End Treatments should be Welded which is used to connect to pipe or elbow.
The other End Treatment should be Flanged, which is used to connect to another flange.
In case the Style is Butt Welded and Flanged and not only Flanged
For the flange, one End Treatment should be Butt Welded instead of Welded.