Automotive Body-in-White (BIW) Architecture: Materials, Hemming & Spot Weld Pitch

September 08, 2026 - BY Admin

Automotive Body-in-White (BIW) Architecture: Materials, Hemming & Spot Weld Pitch

The Structural Core of Passenger Vehicle Safety and Rigidity

Body-in-White (BIW) refers to the welded sheet metal frame of an automobile before the engine, chassis, and interior trims are installed. BIW engineers balance torsional stiffness with strict passenger crash safety mandates.

Core Engineering Considerations in BIW

Designing automotive body structures requires coordinating advanced materials with high-volume assembly lines.

High-Strength Steels & Aluminum: Mixing dual-phase steels and press-hardened boron steels for passenger safety cells.
Spot Weld Pitch Rules: Maintaining 35mm to 50mm weld spacing to prevent current shunting between adjacent spot welds.
Roller Hemming Parameters: Flanging outer body panels over inner reinforcements without surface wrinkling or paint crazing.

Master automotive sheet metal design in the CATIA BIW Engineering Program at CADDEX.

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