LaufFGL
Laser deposition welding of functional layers from shape memory alloys
Motivation
Fastening solutions must ensure detachability, safety, and cost-efficiency. However, temperature fluctuations can cause settlement losses that reduce preload and compromise joint integrity. Existing solutions such as lock washers, lock nuts, or chemical thread-locking agents are purely passive and cannot actively compensate for temperature-induced preload loss, leaving long-term safety unresolved.
Scope
The aim of this project is to integrate an active element into a bolted joint that counteracts temperature-related setting losses and ensures the safety of the bolted joint. For this purpose, a shape memory alloy (SMA) actuator is used, which is minimally and locally introduced into the bolted joint by laser deposition welding (DED-LB/M). As a result, the material is used in a resource-saving and cost-efficient manner, which is of particular interest for the high quantities of fasteners. In particular, chemical (passive) threadlockers, which have a long-term harmful effect on aquatic organisms, could be replaced by the planned compound. The process thus represents an energy-efficient and sustainable solution in which an innovative material is combined with an intelligent production process.
Partners
Funding
LaufFGL is being funded as part of the Industrie.IN.NRW innovation competition within the EFRE/JTF program 2021–2027 by the State of North Rhine-Westphalia and the European Union.
