Weldments functionality enables you to design a weldment structure as a single multibody part.
You use 2D and 3D sketches to define the basic framework. Then you create structural members containing groups of sketch segments. You can also add items such as gussets and end caps using tools on the Weldments toolbar.

For more information about weldments, see SolidWorks Tutorials: Weldments by clicking .
When you create the first structural member in a part, a weldment feature
is created and added to the FeatureManager design tree. The software also creates two default configurations in the ConfigurationManager: a parent configuration Default[As Machined] and a derived configuration Default[As Welded].