Choosing Between SPR and Spot Welding for Body-in-White

Self-Piercing Riveting (SPR) and resistance spot welding both join sheet metal — but they solve different problems.

Spot welding is fastest and cheapest when both sheets are similar steels. It struggles with aluminium-to-steel joints, coated materials and thick stacks.

SPR handles dissimilar-metal, coated and aluminium-heavy assemblies without needing a hot process. The cost per joint is higher but the material freedom is unmatched.

For automotive body-in-white today, most OEMs use both — spot welding where they can, SPR where they must. We design cells to accommodate either or both.