en.Wedoany.com Reported - The Institute for Materials Testing (MPA) at the University of Stuttgart has developed a robotic friction stir spot welding gun named "Steppwelder." This device can join high-strength aluminum alloys at record speeds without the need for heavy external support equipment. The Technology Licensing Office (Technologie-Lizenz-Büro GmbH) is driving the commercialization of this patented innovation, aiming to address the demand for lightweight manufacturing in electric vehicles.
As the automotive industry demands increased driving range, the application of lightweight aluminum alloys and aluminum-steel hybrid connections is growing. Traditional friction stir welding methods often require heavy support structures due to high process forces, limiting flexibility in mass production. The MPA team, led by project manager Dominik Walz and inventors Florian Panzer, Stefan Weihe, and Dr.-Ing. Martin Werz, has successfully tackled this challenge.
The core innovation of the Steppwelder gun lies in its integrated, actively movable support device, which creates a closed force flow within the gun's frame. This enables the device to operate on standard six-axis industrial robots without additional complex equipment, significantly enhancing the applicability and efficiency of robotic friction stir welding.
Highlights of the technology include a step-seam welding function, allowing for rapid completion of 2D and 3D welds by arranging short weld seams. For example, a 50-centimeter-long weld seam can be completed in approximately 2 seconds, demonstrating a high level of technological maturity. A complete welding cell, including a digital twin, is ready for validation trials.
By the end of the validation phase in June 2026, the robotic technology is expected to reach market maturity in the automotive, aerospace, and mechanical engineering sectors. Beyond economic advantages, the Steppwelder excels in sustainability: it requires no filler material, produces no fumes or spatter, has low energy consumption, and enables weight reduction on complex components like battery housings. The project received approximately 1.4 million euros in "VIP+" funding from the German Federal Ministry of Education and Research (BMBF).
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