Union

Use Union to combine multiple solid bodies into a single continuous, manifold solid. Union merges overlapping and adjacent bodies, creating a unified part suitable for manufacturing, analysis, or further modeling operations.

Options

Solids

Select two or more solid bodies to merge into a single body. The result will:

• Contain all the volume from the input solids
• Have no internal boundaries where bodies overlapped
• Be a single piece ready for manufacturing

Bodies don't need to touch to be unioned, but if they don't overlap you'll get a multi-piece result.

Design Applications

Feature Consolidation

Combine multiple modeled features into a single body:

• Merge bosses and ribs onto base geometry
• Consolidate weldment components
• Unite separately-designed sections of complex parts

Assembly Simplification

Convert multi-body assemblies into single-part representations:

• Create monolithic castings from multi-piece designs
• Generate 3D printing models from assembled components
• Simplify part counts for manufacturing

Boolean Workflows

Union is often used in combination with other boolean operations:

1. Create multiple base features separately
2. Union them into a single body
3. Use Subtract to remove unwanted volumes
4. Apply finishing operations (fillets, chamfers) to the unified geometry