StructX > Additional Resources > AutoCAD > Structural Sections > WB Blocks
As with Welded Columns (UC) Welded Beams (WB) can be made to almost size and dimensions and are typically used for the large spans or high loading conditions. The last number in the Universal Description is the weight of the beam in kg per m.
Additional information regarding the properties of UB sections can be found Here.
StructX has proved the following free AutoCAD blocks that can be used to aid with structural drafting. Simply click on the most relevant image to download the latest drawing file. It should be noted that some browsers will require you to "right click > save link as" to save a copy.