Light-join: Joining technologies to enable implementation of lightweight structures in automotive

Car manufacturers are developing new ways to glue and fasten lightweight composite parts to metal car bodies, aiming to slash vehicle weight without blowing up production costs. The problem is simple: composites like carbon fibre are strong and light, but joining them to metal components in a fast, reliable, and cheap way has been a bottleneck. Current joining methods are too slow or too expensive for high-volume car production. This project, led by Jaguar Land Rover and Nissan alongside their suppliers, targets that gap head-on. It focuses on rapid joining techniques that can work on an assembly line, not just in a lab. If successful, the impact is concrete. For an all-aluminium vehicle, the approach could cut component weight by 30%; for a steel-based vehicle, by 60%. That directly improves fuel efficiency and reduces emissions without sacrificing performance. Critically, the project aims to push the technology to a manufacturing readiness level where it can be scaled up for mass-market cars. That means lighter, more efficient vehicles could become the norm, not just a premium option. The work also strengthens the UK supply chain for composite manufacturing, making it easier for other industries—from aerospace to rail—to adopt similar lightweighting strategies.