Welding symbol is quite common and should be there in the Base platform too.
I have loaded the detweld.dll /ma files from the mdl application. its giving this error. "OS could not load C:\Configuration\ConfigurationSets\Hatch\Hatch_Common\mdlapps\detweld.dll, error 126.
MDL Loader: Unable to load library (DLL or MDL shared library) detweld"
I am using MicroStation version 10.16.03.11 and testing is pure under local environment. I have copied the dll/ma file from the OpenBuildings Designer
Link to community - https://communities.bentley.com/products/microstation/f/microstation-forum/243719/how-to-add-the-welding-symbol-from-obd-annotation-to-microstation
I second the motion that Bentley should add the menu weld symbols to MicroStation.
It is very unfortunate that this will not be implemented. We have many users in our organization asking for this as everyone does not necessarily use ProStructures.