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Select two or more objects. >
Create panel > 
Geometry button > Body Objects (from drop-down list) > Object Type rollout > Join Bodies
- [statistics]
- Shows the number of edges, vertices, open edges, faces, elements, and volumes in the Body Object produced by Join Bodies.
Operation group
Choose how to combine the joined bodies:
- Weld Edges Only Welds edges of adjoining surfaces (removing the seams or gaps), making them into a single surface. This option does not attempt to determine whether the object is a solid. This often suffices for rendering or combining objects that do not form a closed solid.
- Weld Into Solid Welds edges of adjoining surfaces (removing the seams or gaps), making them into a single solid if possible. The computation to determine whether the object is a solid can take time.
- Weld Edges To Surfaces This option is similar to Weld Edges Only except that edges can also be welded to the middle of a surface.
- Do Nothing Performs no welding or merging.
- Intersect + Merge Faces Surfaces are intersected and merged together to form a solid object bounded by the merged surfaces.
- Boolean Union Combines the shapes logically so that intersecting geometry is removed and a true solid is formed from the overall shape.
- Remove Excess Faces
- Removes trimmed faces that are outside the resulting Body Object. For example, surfaces that are merged with the Intersect + Merge Faces option are trimmed back, and the excess material (faces that are outside of the boundary of the resulting solid) is removed.