Multi-Material Assemblies

Published on 18 November 2020

Vehicle lightweighting is at the heart of the needs and research themes of the current automotive industry. Indeed, a lightweight vehicle allows:

  • Lower carbon emissions. Climate change is a current global challenge that requires collective actions. The automotive sector plays a leading role in reducing CO2 emissions
  • Optimization of vehicle performance, in terms of battery life, acceleration, etc.
  • A reduction in fuel consumption
  • Etc.

Thus, making vehicles lighter and more generally reducing the impact of the automotive market on the environment are at the heart of LISI Automotive’s innovations.

To meet the different needs of the automotive market, we are currently developing three lightweight multi-material assembly solutions:


LISI HOLLOWELD® is an innovative solution for multi-material assemblies, developed specifically to meet the objectives of vehicles’ mass reduction or of the systems of tomorrow. LISI HOLLOWELD® ensures:

  • Robust mechanical resistance (fatigue, vibration, etc.)
  • Lightweight multi-material solution, thanks to its hollow geometry
  • Standard solution compatible with your different sheet thicknesses
  • Self-punching device to equip welded sheets without pre-drilling, can be integrated into your presses
  • Compatible with your existing resistance welding equipment (from 50Hz to 1000Hz)
  • A combination of different types of materials: steels, aluminum alloys and composites, etc.

This assembly solution has been designed to be a “ready to weld” solution, thanks to our support for the product-process pair, and the implementation of optimized characterization means to offer the optimal welding parameters for each application.


Thanks to the combination of the laser texturing of the surfaces to be assembled and the cold projection at very high speed (≈ approximately 500 meters / second) of aluminum alloy powders, LISI µ-MACH ASSEMBLY PROCESS® allows the quick and lasting cold assembly of steels and aluminum alloys.

LISI µ-MACH ASSEMBLY PROCESS® is an innovative, patented assembly process currently under development, which allows:

  • A lightweight and resistant assembly made by Cold Spray
  • Total freedom in the geometry of the assembly
  • An anchoring effect with optimized mechanical resistance
  • Quick assembly, in line with industrial cycle times
  • Can be used on different types of materials: steels, aluminum alloys and composites


The EBS screw range is a range of flow-tapping screws to securely and durably assemble different materials together (carbon-fibre composites, steel, aluminum, composite materials, plastics, etc.). The EBS screws enable:

  • Deletion of pre-drilling operations
  • Creation of a tapped barrel without residual shavings
  • Possibility to assemble additional components in different materials without pre-drilling
  • Low axial pressure required to install the screw
  • Fast screw mounting
  • Ability to remove the EBS screw and reuse the hole formed with a stan­dard ISO screw

In order to lighten the weight of vehicles, our range of EBS fluo-tapping screws allows the assembly of different elements of the Battery Packs of electrified vehicles without weighing them down.

To find out more, or for any other request relating to these multi-material assembly solutions, you can contact us here.

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