From B-pillar to integrated door ring, then to double door rings and rear body skeleton, ArcelorMittal's multi-part integration solution has been continuously evolving with ever-increasing integration levels. Marketed under the name "Simplify™" in China, this solution persistently explores: how to use better materials and more refined processes to make body manufacturing safer, more efficient and more sustainable?
The Challenges of Traditional Manufacturing
In traditional body-in-white manufacturing, dozens of dispersed stamping parts are assembled through hundreds of welding spots. The more parts there are, the lower the structural efficiency. To accommodate multiple platforms and models, manufacturers have to frequently switch on a single production line or add dedicated production lines, leading to soaring capital expenditure and heightened risk of idle capacity. To achieve lightweighting, manufacturers are forced to sacrifice certain crash performance or adopt higher-cost alternative materials. Each "have to" represents an unavoidable "either/or" dilemma in traditional manufacturing.
To break this cycle, it is necessary to reconstruct the body design logic from the source through material and process innovation, making the body itself simpler and more versatile.
How Does Simplify™ Break the Dilemma?
The core of Simplify™ first stems from breakthroughs in materials and processes. Aluminized hot-stamping steels Usibor® and Ductibor® represent the gold standard in high strength and toughness, crash performance and repairability. ArcelorMittal's proprietary "Laser Ablation" technology precisely removes part of the aluminized coating in the welding edge area, ensuring weld strength equivalent to the base material – a technical threshold that other integration solutions currently struggle to match without compromising safety. Combined with Charpy impact testing, performance can be verified without full vehicle crash tests, significantly shortening the development cycle of new steel combinations and welding processes while ensuring safe crash performance in body design.
Based on hot-stamping tailor-welded blank technology, hot-stamping steels of different thicknesses and strength grades are pre-combined into customized tailor-welded blanks, which are then hot-stamped in one go into large integrated structural parts. This is precisely the core value of Simplify™ multi-part integration. With fewer components and faster assembly speed, it empowers automakers with flexible adaptability – regardless of how powertrain forms evolve in the future, production lines can respond with ease. Compared with traditional solutions, Simplify™ reduces the number of parts by up to 75%. Fewer parts mean fewer materials, tooling and process parameters to manage on the production line. This is the underlying logic of flexible manufacturing: supporting more possibilities with fewer changes.
This simplification directly translates into improved production line efficiency: spot welding quantity is reduced by approximately 10%, demand for welding robots decreases, and production line footprint can be reduced by 14%. Whether building new factories or retrofitting existing lines, capital expenditure can be reduced by 10%. Less is More – the wisest solutions on the production line are often the simplest ones. This marks the beginning of "and".
Safe AND Sustainable
Simplify™'s "zero compromise" is first and foremost reflected in safety. Compared with other part integration solutions on the market, Simplify™ is the only solution that reduces costs without sacrificing safety. By using the right thickness and grade of steel in the right positions, it constructs a safety cage structure with optimal strength and energy absorption performance. In real crash accidents, ample cases have demonstrated its critical role in saving lives.
In terms of sustainability, fewer parts mean fewer molds, shorter process chains, as well as lower energy consumption and less scrap. By eliminating overlapping areas and optimizing material layout, Simplify™ multi-part integration achieves over 10% weight reduction, 20% less production scrap, and 14% lower material consumption compared with traditional designs, with corresponding reductions in assembly shop space and equipment requirements. Furthermore, VAMA uses recyclable materials and green electricity to produce Usibor® and Ductibor® with renewable substrates, significantly reducing carbon footprint. The combination of these low-carbon materials with the Simplify™ solution delivers quantifiable carbon emission reductions in key structural components.
Future-Oriented Competitiveness
The value of Simplify™ multi-part integration lies not only in addressing current manufacturing challenges, but also in reserving ample space for future body design. Combining high strength-toughness with modular flexibility, it enables seamless adaptation to rapid iterations of future cross-platform models and technologies while controlling weight, cost and complexity.
This is precisely why multi-part integration is being increasingly adopted by automakers worldwide at an accelerating pace. With ArcelorMittal's global footprint and advanced automotive steel technology, Simplify™ multi-part integration solutions are within reach wherever you are, helping automakers reduce part count, improve performance, simplify production and confidently face future challenges. This sustainable, scalable solution will continue to enable safer, lighter and more efficient automotive design and manufacturing, making "zero compromise" the hard-core strength for automakers to maintain long-term competitiveness in the fast-changing market.
