Part Union

From FreeCAD Documentation
Jump to navigation Jump to search
This page is a translated version of the page Part Fuse and the translation is 12% complete.
Outdated translations are marked like this.
Other languages:
Deutsch • ‎English • ‎español • ‎français • ‎italiano • ‎polski • ‎português do Brasil • ‎română • ‎svenska • ‎čeština • ‎русский
Arrow-left.svg Previous: Part Cut.svg Cut
Next: Common Part Common.svg Arrow-right.svg

Part Fuse.png Part Union

Ubicación en el Menú
Part → Boolean → Union
Entornos de trabajo
Atajo de teclado por defecto
Introducido en versión
Ver también
Part Cut, Part Common


Fusiona (unión) los objetos Pieza seleccionados en uno. Esta operación es completamente paramétrica y los componentes pueden ser modificdos y el resultado recalculado.

Note: This command is an automated form of the Part Boolean.svg Boolean operation.


  1. Select two or more shapes
  2. There are several ways to invoke the command:
    • Press the Part Fuse.svg Part Fuse button in the Part tools toolbar
    • Use the Part → Boolean → Union entry in the Part menu

Supported inputs

Input objects must be OpenCASCADE shapes. Examples: stuff made with Part, PartDesign, Sketcher workbenches. Not meshes (unless those were converted to shapes) - for meshes, there are specific Boolean tools in MeshDesign workbench.

  • Solid + Solid: the result is a solid that occupies all the volume covered by the inputs
  • Shell + Shell, Shell + Face, Face + Face: the result is a shell. Where faces intersect, they are split. Shells can be non-manifold. After fusion, faces can be united by Refining the result.
  • Wire + Wire, Edge + Wire, Edge + Edge: the result is a wire. Edges are split where they intersect.

Compounds are supported; however, it is assumed that shapes packed into a compound do not touch or intersect. If they actually do, Fusion will likely fail, or produce an incorrect result.


Items can be added and removed from the fusion, by dragging them in or out of the fusion feature in the tree view with the mouse. A manual recompute (press F5 key or click on the Std Refresh.svg Refresh/Recompute icon) is required to see the results.

After this operation is complete, it may be necessary to clean up the shape with Part RefineShape.svg RefineShape.

Arrow-left.svg Previous: Part Cut.svg Cut
Next: Common Part Common.svg Arrow-right.svg